body {
  background-color: black;
  color: white;
}
h1 {
  text-align: center;
}
.center {
  display: flex;
  flex-wrap: wrap;
  height: 80vh;
  justify-content: center;
  align-items: center;
}
.container {
  width: 272px;
  height: 272px;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
}
.box {
  height: 100px;
  width: 100px;
  margin: 3px 6px;
  padding: 10px;
  border-radius: 24px;
  cursor: pointer;
}
.box:hover {
  opacity: 0.8;
}
#box-1 {
  background-color: green;
}
#box-2 {
  background-color: red;
}
#box-3 {
  background-color: yellow;
}
#box-4 {
  background-color: blue;
}