body {
  font-family: sans-serif;
}
#iframe {
  border: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
#edit {
  font-family: monospace;
  font-weight: bold;
  color: rgba(0, 0, 0, 0.54);
  position: absolute;
  z-index: 100;
  position: absolute;
  top: 0.85em;
  right: 1em;
  display: none;
}
#edit:not(:hover) {
  text-decoration: none;
}
#warning {
  position: absolute;
  border-radius: 4px;
  background-color: #feecc2;
  padding: 1em;
  font-size: 16px;
  width: 20em;
  z-index: 100;
  top: 10vh;
  left: 50vw;
  margin-left: -10em;
}
#warning:empty {
  display: none;
}