自己加啊。在css中：

 cite:before {

      content: '';

      position: absolute;

      right: 7px;

      bottom: 7px;

      width: 0;

      height: 0;

      border-width: 4px;

      border-style: solid;

      border-color: #888 transparent transparent transparent;

      transition: all 0.2s;

      -webkit-transition: all 0.2s;

      -moz-transition: all 0.2s;

      -o-transition: all 0.2s;

      -ms-transition: all 0.2s;

      transform-origin: 50% 25%;

      -ms-transform-origin: 50% 25%;

      -moz-transform-origin: 50% 25%;

      -webkit-transform-origin: 50% 25%;

      -o-transform-origin: 50% 25%;

    }