#periodicTable {
  border-collapse: collapse;
  font-size: 12px;
  margin-top: 12px;
  table-layout: fixed;
}

#periodicTable td {
  box-sizing: border-box;
  height: 64px;
  overflow: hidden;
  width: 64px;
}

.element {
  /*padding-top: 12px;*/
  border: 1px solid #000;
  text-align: center;
}