diff --git a/website/pages/_document.js b/website/pages/_document.js
index 431302289..7d7c349a7 100644
--- a/website/pages/_document.js
+++ b/website/pages/_document.js
@@ -14,7 +14,7 @@ export default class MyDocument extends Document {
           <script
             noModule
             dangerouslySetInnerHTML={{
-              __html: `window.MSInputMethodContext && document.documentMode && document.write('<script src="/ie-custom-properties.js"><\\x2fscript>');`,
+              __html: `window.MSInputMethodContext && document.documentMode && document.write('<script src="/ie-warning.js"><\\x2fscript>');`,
             }}
           />
         </body>
diff --git a/website/public/ie-custom-properties.js b/website/public/ie-custom-properties.js
deleted file mode 100644
index 7de1e697f..000000000
--- a/website/public/ie-custom-properties.js
+++ /dev/null
@@ -1,639 +0,0 @@
-/*! ie11CustomProperties.js v2.7.2 | MIT License | https://git.io/fjXMN */
-// c1.onElement helper
-!(function() {
-  'use strict'
-
-  if (!Element.prototype.matches)
-    Element.prototype.matches = Element.prototype.msMatchesSelector
-
-  var w = window
-  if (!w.c1) w.c1 = {}
-  var listeners = [],
-    root = document,
-    Observer
-
-  c1.onElement = function(selector, options /*, disconnectedCallback*/) {
-    if (typeof options === 'function') {
-      options = { parsed: options }
-    }
-    var listener = {
-      selector: selector,
-      immediate: options.immediate,
-      //disconnectedCallback: disconnectedCallback,
-      elements: new WeakMap()
-    }
-
-    if (options.parsed) {
-      listener.parsed = function(el) {
-        requestAnimationFrame(function() {
-          options.parsed(el)
-        })
-      }
-    }
-
-    var els = root.querySelectorAll(listener.selector),
-      i = 0,
-      el
-    while ((el = els[i++])) {
-      listener.elements.set(el, true)
-      listener.parsed && listener.parsed.call(el, el)
-      listener.immediate && listener.immediate.call(el, el)
-    }
-
-    listeners.push(listener)
-    if (!Observer) {
-      Observer = new MutationObserver(checkMutations)
-      Observer.observe(root, {
-        childList: true,
-        subtree: true
-      })
-    }
-    checkListener(listener)
-  }
-  function checkListener(listener, target) {
-    var i = 0,
-      el,
-      els = []
-    target && target.matches(listener.selector) && els.push(target)
-    if (loaded) {
-      // ok? check inside node on innerHTML - only when loaded
-      Array.prototype.push.apply(
-        els,
-        (target || root).querySelectorAll(listener.selector)
-      )
-    }
-    while ((el = els[i++])) {
-      if (listener.elements.has(el)) continue
-      listener.elements.set(el, true)
-      //listener.connectedCallback.call(el, el);
-      listener.parsed && listener.parsed.call(el, el)
-      listener.immediate && listener.immediate.call(el, el)
-    }
-  }
-  function checkListeners(inside) {
-    var i = 0,
-      listener
-    while ((listener = listeners[i++])) checkListener(listener, inside)
-  }
-  function checkMutations(mutations) {
-    var j = 0,
-      i,
-      mutation,
-      nodes,
-      target
-    while ((mutation = mutations[j++])) {
-      ;(nodes = mutation.addedNodes), (i = 0)
-      while ((target = nodes[i++]))
-        target.nodeType === 1 && checkListeners(target)
-    }
-  }
-
-  var loaded = false
-  document.addEventListener('DOMContentLoaded', function() {
-    loaded = true
-  })
-
-  // svg polyfills
-  function copyProperty(prop, from, to) {
-    var desc = Object.getOwnPropertyDescriptor(from, prop)
-    Object.defineProperty(to, prop, desc)
-  }
-  if (!('classList' in Element.prototype)) {
-    copyProperty('classList', HTMLElement.prototype, Element.prototype)
-  }
-  if (!('innerHTML' in Element.prototype)) {
-    copyProperty('innerHTML', HTMLElement.prototype, Element.prototype)
-  }
-  if (!('sheet' in SVGStyleElement.prototype)) {
-    Object.defineProperty(SVGStyleElement.prototype, 'sheet', {
-      get: function() {
-        var all = document.styleSheets
-        for (var i = 0, sheet; (sheet = all[i++]); ) {
-          if (sheet.ownerNode === this) return sheet
-        }
-      }
-    })
-  }
-  // if ('children' in HTMLElement.prototype && !('children' in Element.prototype)) {
-  // 	copyProperty('children', HTMLElement.prototype, Element.prototype);
-  // }
-  // if ('contains' in HTMLElement.prototype && !('contains' in Element.prototype)) {
-  // 	copyProperty('contains', HTMLElement.prototype, Element.prototype);
-  // }
-  // if ('getElementsByClassName' in HTMLElement.prototype && !('getElementsByClassName' in Element.prototype)) {
-  // 	copyProperty('getElementsByClassName', HTMLElement.prototype, Element.prototype);
-  // }
-})()
-
-// main logic
-!(function() {
-  'use strict'
-  var testEl = document.createElement('i')
-  testEl.style.setProperty('--x', 'y')
-  if (testEl.style.getPropertyValue('--x') === 'y' || !testEl.msMatchesSelector)
-    return
-
-  // cached regexps, better performance
-  const regFindSetters = /([\s{;])(--([A-Za-z0-9-_]+\s*:[^;!}{]+)(!important)?)(?=\s*([;}]|$))/g
-  const regFindGetters = /([{;]\s*)([A-Za-z0-9-_]+\s*:[^;}{]*var\([^!;}{]+)(!important)?(?=\s*([;}$]|$))/g
-  const regRuleIEGetters = /-ieVar-([^:]+):/g
-  const regRuleIESetters = /-ie-([^};]+)/g
-  const regHasVar = /var\(/
-  const regPseudos = /:(hover|active|focus|target|:before|:after)/
-
-  c1.onElement('link[rel="stylesheet"]', {
-    immediate: function(el) {
-      fetchCss(el.href, function(css) {
-        var newCss = rewriteCss(css)
-        if (css === newCss) return
-        newCss = relToAbs(el.href, newCss)
-        el.disabled = true
-        var style = document.createElement('style')
-        el.parentNode.insertBefore(style, el)
-        activateStyleElement(style, newCss)
-      })
-    }
-  })
-  c1.onElement('style', {
-    immediate: function(el) {
-      if (el.hasAttribute('ie-polyfilled')) return
-      if (el.ieCP_elementSheet) return
-      var css = el.innerHTML
-      var newCss = rewriteCss(css)
-      if (css === newCss) return
-      activateStyleElement(el, newCss)
-    }
-  })
-  c1.onElement('[ie-style]', {
-    immediate: function(el) {
-      var newCss = rewriteCss('{' + el.getAttribute('ie-style')).substr(1)
-      el.style.cssText += ';' + newCss
-      var found = parseRewrittenStyle(el.style)
-      if (found.getters) addGetterElement(el, found.getters, '%styleAttr')
-      if (found.setters) addSetterElement(el, found.setters)
-    }
-  })
-
-  function relToAbs(base, css) {
-    return css.replace(/url\(([^)]+)\)/g, function($0, $1) {
-      $1 = $1.trim().replace(/(^['"]|['"]$)/g, '')
-      if ($1.match(/^([a-z]+:|\/)/)) return $0
-      base = base.replace(/\?.*/, '')
-      return 'url(' + base + './../' + $1 + ')'
-    })
-  }
-
-  // ie has a bug, where unknown properties at pseudo-selectors are computed at the element
-  // #el::after { -content:'x'; } => getComputedStyle(el)['-content'] == 'x'
-  // should we add something like -ieVar-pseudo_after-content:'x'?
-  function rewriteCss(css) {
-    /* uncomment if spec finished and needed by someone
-  css = css.replace(/@property ([^{]+){([^}]+)}/, function($0, prop, body){
-    prop = prop.trim();
-    const declaration = {name:prop};
-    body.split(';').forEach(function(pair){
-      const x = pair.split(':');
-      if (x[1]) declaration[ x[0].trim() ] = x[1];
-    });
-    declaration['inherits'] = declaration['inherits'].trim()==='true' ? true : false;
-    declaration['initialValue'] = declaration['initial-value'];
-    CSS.registerProperty(declaration)
-    return '/*\n @property ... removed \n*'+'/';
-  });
-  */
-
-    return css
-      .replace(regFindSetters, function($0, $1, $2, $3, important) {
-        return $1 + '-ie-' + (important ? '❗' : '') + $3
-      })
-      .replace(regFindGetters, function($0, $1, $2, important) {
-        return $1 + '-ieVar-' + (important ? '❗' : '') + $2 + '; ' + $2 // keep the original, so chaining works "--x:var(--y)"
-      })
-  }
-
-  // beta
-  const styles_of_getter_properties = {}
-
-  function parseRewrittenStyle(style) {
-    // less memory then parameter cssText?
-
-    // beta
-    style['z-index'] // ie11 can access unknown properties in stylesheets only if accessed a dashed known property
-
-    const cssText = style.cssText
-    var matchesGetters = cssText.match(regRuleIEGetters),
-      j,
-      match
-    if (matchesGetters) {
-      var getters = [] // eg. [border,color]
-      for (j = 0; (match = matchesGetters[j++]); ) {
-        let propName = match.slice(7, -1)
-        if (propName[0] === '❗') propName = propName.substr(1)
-        getters.push(propName)
-
-        // beta
-        if (!styles_of_getter_properties[propName])
-          styles_of_getter_properties[propName] = []
-        styles_of_getter_properties[propName].push(style)
-      }
-    }
-    var matchesSetters = cssText.match(regRuleIESetters)
-    if (matchesSetters) {
-      var setters = {} // eg. [--color:#fff, --padding:10px];
-      for (j = 0; (match = matchesSetters[j++]); ) {
-        let x = match.substr(4).split(':')
-        let propName = x[0]
-        let propValue = x[1]
-        if (propName[0] === '❗') propName = propName.substr(1)
-        setters[propName] = propValue
-      }
-    }
-    return { getters: getters, setters: setters }
-  }
-  function activateStyleElement(style, css) {
-    style.innerHTML = css
-    style.setAttribute('ie-polyfilled', true)
-    var rules = style.sheet.rules,
-      i = 0,
-      rule // cssRules = CSSRuleList, rules = MSCSSRuleList
-    while ((rule = rules[i++])) {
-      const found = parseRewrittenStyle(rule.style)
-      if (found.getters) addGettersSelector(rule.selectorText, found.getters)
-      if (found.setters) addSettersSelector(rule.selectorText, found.setters)
-
-      // mediaQueries: redraw the hole document
-      // better add events for each element?
-      const media =
-        rule.parentRule &&
-        rule.parentRule.media &&
-        rule.parentRule.media.mediaText
-      if (media && (found.getters || found.setters)) {
-        matchMedia(media).addListener(function() {
-          drawTree(document.documentElement)
-        })
-      }
-    }
-
-    // beta
-    redrawStyleSheets()
-  }
-
-  function addGettersSelector(selector, properties) {
-    selectorAddPseudoListeners(selector)
-    c1.onElement(unPseudo(selector), {
-      immediate: function(el) {
-        addGetterElement(el, properties, selector)
-        drawElement(el)
-      }
-    })
-  }
-  function addGetterElement(el, properties, selector) {
-    var i = 0,
-      prop,
-      j
-    const selectors = selector.split(',') // split grouped selectors
-    el.setAttribute('iecp-needed', true)
-    if (!el.ieCPSelectors) el.ieCPSelectors = {}
-    while ((prop = properties[i++])) {
-      for (j = 0; (selector = selectors[j++]); ) {
-        const parts = selector.trim().split('::')
-        if (!el.ieCPSelectors[prop]) el.ieCPSelectors[prop] = []
-        el.ieCPSelectors[prop].push({
-          selector: parts[0],
-          pseudo: parts[1] ? '::' + parts[1] : ''
-        })
-      }
-    }
-  }
-  function addSettersSelector(selector, propVals) {
-    selectorAddPseudoListeners(selector)
-    c1.onElement(unPseudo(selector), {
-      immediate: function(el) {
-        addSetterElement(el, propVals)
-      }
-    })
-  }
-  function addSetterElement(el, propVals) {
-    if (!el.ieCP_setters) el.ieCP_setters = {}
-    for (var prop in propVals) {
-      // eg. {foo:#fff, bar:baz}
-      el.ieCP_setters['--' + prop] = 1
-    }
-    drawTree(el)
-  }
-
-  //beta
-  function redrawStyleSheets() {
-    for (var prop in styles_of_getter_properties) {
-      let styles = styles_of_getter_properties[prop]
-      for (var i = 0, style; (style = styles[i++]); ) {
-        if (style.owningElement) continue
-        var value = style['-ieVar-' + prop]
-        if (!value) continue
-        var value = styleComputeValueWidthVars(
-          getComputedStyle(document.documentElement),
-          value
-        )
-        if (value === '') continue
-        style[prop] = value
-      }
-    }
-  }
-
-  const pseudos = {
-    hover: {
-      on: 'mouseenter',
-      off: 'mouseleave'
-    },
-    focus: {
-      on: 'focusin',
-      off: 'focusout'
-    },
-    active: {
-      on: 'CSSActivate',
-      off: 'CSSDeactivate'
-    }
-  }
-  function selectorAddPseudoListeners(selector) {
-    // ie11 has the strange behavoir, that groups of selectors are individual rules, but starting with the full selector:
-    // td, th, button { color:red } results in this rules:
-    // "td, th, button" | "th, th" | "th"
-    selector = selector.split(',')[0]
-    for (var pseudo in pseudos) {
-      var parts = selector.split(':' + pseudo)
-      if (parts.length > 1) {
-        var ending = parts[1].match(/^[^\s]*/) // ending elementpart of selector (used for not(:active))
-        let sel = unPseudo(parts[0] + ending)
-        const listeners = pseudos[pseudo]
-        c1.onElement(sel, function(el) {
-          el.addEventListener(listeners.on, drawTreeEvent)
-          el.addEventListener(listeners.off, drawTreeEvent)
-        })
-      }
-    }
-  }
-  let CSSActive = null
-  document.addEventListener('mousedown', function(e) {
-    setTimeout(function() {
-      if (e.target === document.activeElement) {
-        var evt = document.createEvent('Event')
-        evt.initEvent('CSSActivate', true, true)
-        CSSActive = e.target
-        CSSActive.dispatchEvent(evt)
-      }
-    })
-  })
-  document.addEventListener('mouseup', function() {
-    if (CSSActive) {
-      var evt = document.createEvent('Event')
-      evt.initEvent('CSSDeactivate', true, true)
-      CSSActive.dispatchEvent(evt)
-      CSSActive = null
-    }
-  })
-
-  function unPseudo(selector) {
-    return selector.replace(regPseudos, '').replace(':not()', '')
-  }
-
-  var uniqueCounter = 0
-
-  function _drawElement(el) {
-    if (!el.ieCP_unique) {
-      // use el.uniqueNumber? but needs class for the css-selector => test performance
-      el.ieCP_unique = ++uniqueCounter
-      el.classList.add('iecp-u' + el.ieCP_unique)
-    }
-    var style = getComputedStyle(el)
-    if (el.ieCP_sheet)
-      while (el.ieCP_sheet.rules[0]) el.ieCP_sheet.deleteRule(0)
-    for (var prop in el.ieCPSelectors) {
-      var important = style['-ieVar-❗' + prop]
-      let valueWithVar = important || style['-ieVar-' + prop]
-      if (!valueWithVar) continue // todo, what if '0'
-
-      var details = {}
-      var value = styleComputeValueWidthVars(style, valueWithVar, details)
-
-      if (important) value += ' !important'
-      for (var i = 0, item; (item = el.ieCPSelectors[prop][i++]); ) {
-        // todo: split and use requestAnimationFrame?
-        if (item.selector === '%styleAttr') {
-          el.style[prop] = value
-        } else {
-          // beta
-          if (!important && details.allByRoot !== false) continue // dont have to draw root-properties
-
-          //let selector = item.selector.replace(/>? \.[^ ]+/, ' ', item.selector); // todo: try to equalize specificity
-          let selector = item.selector
-          elementStyleSheet(el).insertRule(
-            selector +
-              '.iecp-u' +
-              el.ieCP_unique +
-              item.pseudo +
-              ' {' +
-              prop +
-              ':' +
-              value +
-              '}',
-            0
-          ) // faster then innerHTML
-        }
-      }
-    }
-  }
-  function elementStyleSheet(el) {
-    if (!el.ieCP_sheet) {
-      var tag = document.createElement('style')
-      tag.ieCP_elementSheet = 1
-      //el.appendChild(tag); // yes! self-closing tags can have style as children, but - if i set innerHTML, the stylesheet is lost
-      document.head.appendChild(tag)
-      el.ieCP_sheet = tag.sheet
-    }
-    return el.ieCP_sheet
-  }
-  function drawTree(target) {
-    if (!target) return
-    var els = target.querySelectorAll('[iecp-needed]')
-    if (target.hasAttribute && target.hasAttribute('iecp-needed'))
-      drawElement(target) // self
-    for (var i = 0, el; (el = els[i++]); ) drawElement(el) // tree
-  }
-  // draw queue
-  let drawQueue = new Set()
-  let collecting = false
-  let drawing = false
-  function drawElement(el) {
-    drawQueue.add(el)
-    if (collecting) return
-    collecting = true
-    requestAnimationFrame(function() {
-      collecting = false
-      drawing = true
-      drawQueue.forEach(_drawElement)
-      requestAnimationFrame(function() {
-        // mutationObserver will trigger delayed
-        drawing = false
-      })
-      drawQueue.clear()
-    })
-  }
-
-  function drawTreeEvent(e) {
-    drawTree(e.target)
-  }
-
-  const regValueGetters = /var\(([^),]+)(\,(.+))?\)/g
-  function styleComputeValueWidthVars(style, valueWithVar, details) {
-    return valueWithVar.replace(regValueGetters, function(
-      full,
-      variable,
-      x,
-      fallback
-    ) {
-      variable = variable.trim()
-      var pValue = style.getPropertyValue(variable)
-      if (details && style.lastPropertyServedBy !== document.documentElement)
-        details.allByRoot = false
-      if (pValue === '' && fallback !== undefined) pValue = fallback.trim() // fallback
-      return pValue
-    })
-  }
-
-  // mutation listener
-  var observer = new MutationObserver(function(mutations) {
-    if (drawing) return
-    for (var i = 0, mutation; (mutation = mutations[i++]); ) {
-      if (mutation.attributeName === 'ie-polyfilled') continue
-      if (mutation.attributeName === 'iecp-needed') continue
-      // recheck all selectors if it targets new elements?
-      drawTree(mutation.target)
-    }
-  })
-  setTimeout(function() {
-    observer.observe(document, { attributes: true, subtree: true })
-  })
-
-  // :target listener
-  var oldHash = location.hash
-  addEventListener('hashchange', function(e) {
-    var newEl = document.getElementById(location.hash.substr(1))
-    if (newEl) {
-      var oldEl = document.getElementById(oldHash.substr(1))
-      drawTree(newEl)
-      drawTree(oldEl)
-    } else {
-      drawTree(document)
-    }
-    oldHash = location.hash
-  })
-
-  // add owningElement to Element.style
-  var descriptor = Object.getOwnPropertyDescriptor(
-    HTMLElement.prototype,
-    'style'
-  )
-  var styleGetter = descriptor.get
-  descriptor.get = function() {
-    const style = styleGetter.call(this)
-    style.owningElement = this
-    return style
-  }
-  Object.defineProperty(HTMLElement.prototype, 'style', descriptor)
-
-  // add computedFor to computed style-objects
-  var originalGetComputed = getComputedStyle
-  window.getComputedStyle = function(el) {
-    var style = originalGetComputed.apply(this, arguments)
-    style.computedFor = el
-    //style.pseudoElt = pseudoElt; //not needed at the moment
-    return style
-  }
-
-  // getPropertyValue / setProperty hooks
-  const StyleProto = CSSStyleDeclaration.prototype
-
-  const oldGetP = StyleProto.getPropertyValue
-  StyleProto.getPropertyValue = function(property) {
-    this.lastPropertyServedBy = false
-    if (property[0] !== '-' || property[1] !== '-')
-      return oldGetP.apply(this, arguments)
-    const undashed = property.substr(2)
-    const ieProperty = '-ie-' + undashed
-    const iePropertyImportant = '-ie-❗' + undashed
-    let value = this[iePropertyImportant] || this[ieProperty]
-    if (this.computedFor) {
-      // computedStyle
-      if (value !== undefined) {
-        if (regHasVar.test(value)) {
-          value = styleComputeValueWidthVars(this, value)
-        }
-        this.lastPropertyServedBy = this.computedFor
-      } else {
-        if (!register[property] || register[property].inherits) {
-          // inherited
-          //let el = this.pseudoElt ? this.computedFor : this.computedFor.parentNode;
-          let el = this.computedFor.parentNode
-          while (el.nodeType === 1) {
-            // how slower would it be to getComputedStyle for every element, not just with defined ieCP_setters
-            if (el.ieCP_setters && el.ieCP_setters[property]) {
-              // i could make
-              // value = el.nodeType ? getComputedStyle(this.computedFor.parentNode).getPropertyValue(property)
-              // but i fear performance, stupid?
-              var style = getComputedStyle(el)
-              var tmpVal = style[iePropertyImportant] || style[ieProperty]
-              if (tmpVal !== undefined) {
-                value = tmpVal
-                if (regHasVar.test(value)) {
-                  // calculated style from current element not from the element the value was inherited from! (style, value)
-                  value = styleComputeValueWidthVars(this, value)
-                }
-                this.lastPropertyServedBy = el
-                break
-              }
-            }
-            el = el.parentNode
-          }
-        }
-      }
-    }
-    if (value === undefined && register[property])
-      value = register[property].initialValue
-    if (value === undefined) value = ''
-    return value
-  }
-
-  const oldSetP = StyleProto.setProperty
-  StyleProto.setProperty = function(property, value, prio) {
-    if (property[0] !== '-' || property[1] !== '-')
-      return oldSetP.apply(this, arguments)
-    if (this.owningElement) {
-      const el = this.owningElement
-      if (!el.ieCP_setters) el.ieCP_setters = {}
-      el.ieCP_setters[property] = 1
-      drawTree(el)
-    }
-    property = '-ie-' + (prio === 'important' ? '❗' : '') + property.substr(2)
-    this.cssText += '; ' + property + ':' + value + ';'
-    //this[property] = value;
-  }
-
-  if (!window.CSS) window.CSS = {}
-  const register = {}
-  CSS.registerProperty = function(options) {
-    register[options.name] = options
-  }
-
-  // utils
-  function fetchCss(url, callback) {
-    var request = new XMLHttpRequest()
-    request.open('GET', url)
-    request.overrideMimeType('text/css')
-    request.onload = function() {
-      if (request.status >= 200 && request.status < 400) {
-        callback(request.responseText)
-      }
-    }
-    request.send()
-  }
-})()
diff --git a/website/public/ie-warning.js b/website/public/ie-warning.js
new file mode 100644
index 000000000..db619bfea
--- /dev/null
+++ b/website/public/ie-warning.js
@@ -0,0 +1,40 @@
+!(function () {
+  'use strict'
+
+  function applyStyles(e, s) {
+    e.style.cssText = s
+      .map(function (r) {
+        return r.join(':')
+      })
+      .join(';')
+  }
+
+  const el = document.createElement('div')
+  const containerStyles = [
+    ['background-color', '#FCF0F2'],
+    ['border-bottom', '1px solid #FFD4D6'],
+    ['color', '#BA2226'],
+    ['text-align', 'center'],
+    ['font-family', '"Segoe UI", sans-serif'],
+    ['font-weight', 'bold'],
+  ]
+  applyStyles(el, containerStyles)
+
+  const message = document.createElement('p')
+  const textStyles = [
+    ['padding', '16px 0'],
+    ['margin', '0'],
+    ['color', '#BA2226'],
+  ]
+  applyStyles(message, textStyles)
+  message.textContent = 'Internet Explorer is no longer supported. '
+
+  const link = document.createElement('a')
+  link.textContent = 'Learn more.'
+  link.href = 'https://www.microsoft.com/en-us/edge?form=MA13DL&OCID=MA13DL'
+
+  message.appendChild(link)
+  el.appendChild(message)
+
+  document.body.insertBefore(el, document.body.childNodes[0])
+})()