a:link {
    color: blue;
    text-decoration: none;
    background-color:yellow;
    padding:20px;
    margin-top:20px;
  }
  
  /* visited link */
  a:visited {
    color: green;
    background-color: yellow;
    padding:20px;
        }
  
  /* mouse over link */
  a:hover {
    color: hotpink;
    background-color: yellow;
    padding:20px;
  }
  
  /* selected link */
  a:active {
    color:aquamarine;
    background-color: yellow;
    padding:20px;
  }