Edit in JSFiddle

<button>Sign Up</button>  

button {
      color:white;
      border:0;
      font-size:2em;
      padding:0.3em 1em;
      
      /*
      * The important stuff
      */
      background-color:tan;
      transition:all linear 0.2s;
    }

    button:hover {
      background-color:wheat;
    }