html, body {
  overflow: hidden;
}

#map {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

.no-webgl-message {
  display: none;
}

html.no-webgl .no-webgl-message{
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  box-sizing: border-box;
  z-index: 1001; /* Ensures visibility in IE8 */
  padding: 10px;
  font-family: sans-serif;
  background-color: lightyellow;
  border-bottom: 1px solid gold;
}