div {
  width: 12em;
  height: 3em;
  transition: background-color 50ms ease-in-out;
  color: white;
  text-align: center;
  line-height: 3em;
  text-transform: uppercase;
  font-family: "bentonsans";
  font-weight: bold;
  -webkit-font-smoothing: antialiased;
  letter-spacing: 0.03em;
}

.green {
  background-color: #1eb478;
}
.green:active {
  background-color: #1ba36c;
}

.gray {
  background-color: #6a737b;
}
.gray:active {
  background-color: #616970;
}