#kunkun {
          border: 0;
          line-height: 2.5;
          padding: 0 20px;
          font-size: 1rem;
          text-align: center;
          color: #fff;
          text-shadow:1px 1px 1px #000;
          border-radius: 10px;
	  background-color: rgba(220, 0, 0, 1);
	  background-image: linear-gradient(to top left,rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.2) 30%, rgba(0, 0, 0, 0));
          box-shadow: inset 2px 2px 3px rgba(255, 255, 255, 0.6), inset -2px -2px 3px rgba(0, 0, 0, 0.6);
      }
      #kunkun:hover {
          background-color: rgba(255,255, 0, 1);
      }
      #kunkun:active {
           box-shadow: inset -2px -2px 3px rgba(255, 255, 255, 0.6), inset 2px 2px 3px rgba(0, 0, 0, 0.6);
      }