#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;
  }