* {
  box-sizing: border-box;
}

body {
  background-color: beige;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0;
}

.box {
  background-color: cadetblue;
  height: 200px;
  width: 300px;
  margin: 10px;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 15px;
  color: white;
  font-size: 30px;
  transition: transform 0.5s linear;
  padding: 20px;
}

.box:nth-of-type(even) {
  transform: translate(400%);
}

.box:nth-of-type(odd) {
  transform: translateX(-400%);
}

.box.show {
  transform: translateX(0);
}