body {
  background-color: #aca;
  text-align: center;
  color: #335;
  user-select: none;

  text-shadow:
  -1px -1px 0 #cca,
  1px -1px 0 #cca,
  -1px 1px 0 #cca,
  1px 1px 0 #cca;
}

.cell {
  cursor: pointer;
  display: inline-block;
  width: 18%;
  margin: 5px;
  background-color: #eec;
  border-color: #aac;
  border-style: solid;
  border-radius: 15px;
}

.cell:hover {
  background-color: #aac;
  transform: rotate(-2deg);
}