css左右箭头

.record-left{

               content: "";

               0;

    height: 0;

               float: left;

    border-top: 10px solid transparent;

    border-right: 10px solid red;

    border-bottom: 10px solid transparent;

    margin-top:5px;

}

.record-right{

               content: "";

               0;

    height: 0;

    float: right;

    border-top: 10px solid transparent;

    border-left: 10px solid red;

    border-bottom: 10px solid transparent;

    margin-top:5px;

    margin-right: 25px;

}