div.themes > div {
  height: 20px;
  width: 20px;
  float: left;
  margin-right: 5px;
  cursor: pointer;
  border: 1px solid #555;
}
.light {
  background-color: #fff;
  color: #000;
}
.dark {
  background-color: #444;
  color: #fff;
}
.yellow {
  background-color: #f5f904;
  color: #000;
}
.green {
  background-color: #97e79a;
  color: #000;
}