style.css

/* Cascading stylesheet for form elements such as buttons
 * "equal" and "clear" are two class names I gave for form buttons
 */

    .equal { 
          background-color: #4CAF50; /* Green */
          border: 2px solid black;
          color: white;
          padding: 4px 7px;
          text-align: center;
          text-decoration: none;
          display: inline-block;
          font-size: 16px;
          width: 50px;
          }
    .equal:hover {
      background-color: #aefe41;
      color: black;
    }
    .clear { 
          background-color: #FF0000; /* Red */
          border: 2px solid black;
          color: yellow;
          padding: 4px 7px;
          text-align: center;
          text-decoration: none;
          display: inline-block;
          font-size: 16px;
          width: 50px;
          }
    .clear:hover {
          background-color: #FFABAB;
          color: black;
    }