body {
  transition: all .3s ease-in-out;
}

.is-over {
  background-color: #333;
  color: #ccc;
}

.fixed-panel {
  position: fixed;
  right: 0;
  bottom: 1em;
  padding: 1.5em;
  background-color: #212121;
  box-shadow: 0 0 4px rgba(0, 0, 0, .3);
  color: #ccc;
  text-align: right;
  font-weight: bold;
}