#container div > img {
  height: 50px;
  width: 50px;
}

#container {
  background-color: white;
  margin-left: 25%;
}

#undo {
  background-color: crimson;
  /* width: 50px; */
  /* height: 50px; */
  padding: 25px;
  margin-top: 25px;
  text-align: center;
  float: left;
  border-radius: 5px;
  /* align-content: center; */
  /* vertical-align: center; */
}

#play {
  position: relative;
  top: 45vh;
  left: 45vw;
  padding: 50px;
  cursor: pointer;
  background-color: crimson;
  border-radius: 1vw;
}