css选择器可以插入图片吗

.p_afterImg {

        background: #eeeeee;

        width: 200px;

        height: 80px;

        border-radius: 6px;

        padding: 10px 20px;

        position: relative;

    }

    .p_afterImg:after {

        content: '';

        background: url('../img/triangle_down.png') no-repeat bottom right /32px 16px;/*兼容没测*/

        position: absolute;

        bottom: -15px;

        z-index: 2;

        width: 32px;

        height: 16px;

    }