body {
  background-color: #292121;
  height: 100vh;
  display: grid;
  place-items: center;
}
.box {
  width: 100px;
  height: 100px;
  border-radius: 10px;
  background-color: #464343;
  margin: 10px;
  transition: 1s;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
}