body {
  font-family: 'Open Sans', sans-serif;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
.panel {

}
.clipboard {
  color: transparent;
  line-height:100px;
  text-align: center;
  font-family: sans-serif;
  width:200px;
  height:200px;
  border: none;
  font-size: 16px;
}
.clipboard:hover {
  font-weight: bold;
  cursor: pointer;
}
.copied {
  display: none;
  background-color: grey;
  position: fixed;
  z-index: 9999;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 999;
  height: 100%;
  width: 100%;
  color: white;
  font-size: 72px;
  font-weight: bold;
  text-align: center;
  line-height: 100%;
  text-transform: uppercase;
}
.copied:before {
  content: "";
  display: inline-block;
  height: 100%;
  vertical-align: middle;
}