<style>

 .opers{

     position:absolute;

     bottom:0px;

     left:0px;

     right:0px;

     height:3rem;

     background-color:#fbfbfb;
　　　　display:flex;
       display:-webkit-box;

 }
　　.opers a:BEFORE{
　　　　font-size:1.25rem;
　　　　display:block;
　　}
　　.opers a{
　　　　flex:1;
　　　　text-align:center;
　　　　-webkit-box-flex:1;
　　　　font-size:0.75rem;
　　}

 .list{

     position:absolute;

     top:1.5rem;

     left:0;

     right:0;

     bottom:3rem;

     background-color:#fefefe;

     overflow:hidden;

 }

 </style>

 <div class="opers">

     <a>新建文件夹</a>

     <a>复制</a>

     <a>删除</a>

 </div>

@font-face {

  font-family: 'fontello';

  src: url('../font/fontello.eot?83914508');

  src: url('../font/fontello.eot?83914508#iefix') format('embedded-opentype'),

       url('../font/fontello.woff?83914508') format('woff'),

       url('../font/fontello.ttf?83914508') format('truetype'),

       url('../font/fontello.svg?83914508#fontello') format('svg');

  font-weight: normal;

  font-style: normal;

}

/* Chrome hack: SVG is rendered more smooth in Windozze. 100% magic, uncomment if you need it. */

/* Note, that will break hinting! In other OS-es font will be not as sharp as it could be */

/*

@media screen and (-webkit-min-device-pixel-ratio:0) {

  @font-face {

    font-family: 'fontello';

    src: url('../font/fontello.svg?83914508#fontello') format('svg');

  }

}

*/

 [class^="icon-"]:before, [class*=" icon-"]:before {

  font-family: "fontello";

  font-style: normal;

  font-weight: normal;

  /* Font smoothing. That was taken from TWBS */

  -webkit-font-smoothing: antialiased;

  -moz-osx-font-smoothing: grayscale;

  /* Uncomment for 3D effect */

  /* text-shadow: 1px 1px 1px rgba(127, 127, 127, 0.3); */

}

.icon-plus:before { content: '\e800'; } /* '' */

.icon-attention-circled:before { content: '\e801'; } /* '' */

.icon-trash-empty:before { content: '\e802'; } /* '' */