.box {
  width: 100px;
  height: 100px;
  margin: 20px;
  background-color: yellow;
  animation: move 2s ease-in-out 3s;
}

.none {
  animation-fill-mode: none;
}

.forwards {
  animation-fill-mode: forwards;
}

.backwards {
  animation-fill-mode: backwards;
}

.both {
  animation-fill-mode: both;
}

@keyframes move {
  from {
    transform: translateX(0);
    background-color: #3498db;
  }
  to {
    transform: translateX(300px);
    background-color: #e74c3c;
  }
}