#box1 {
  background-color: blue;
  color: white;
  border: 2px solid lightblue;
}

#box2 {
  background-color: red;
  color: white;
  border: 2px solid #FFCBE1;
}

#box3 {
  background-color: yellow;
  color: black;
  border: 2px solid #F3C117;
}

#box4 {
  background-color: green;
  color: white;
  border: 2px solid lightgreen;  
}

.box {
  width: 150px;
  height: 150px;
}

#container {
  border: 1px solid #999;
}