.side {
        position: fixed;
        width: 54px;
        height: 275px;
        right: 40px;
        top: 60%;
        z-index: 100;
    }

    .side ul {
        list-style: none;
    }

    .side ul li {
        width: 54px;
        height: 54px;
        float: left;
        position: relative;
        margin-bottom: 1px;
    }

    .side ul li .side-box {
        position: absolute;
        width: 54px;
        height: 54px;
        top: 0;
        right: 0;
        transition: all 0.3s;
        background: #303030;
        opacity: 0.8;
        filter: Alpha(opacity=80);
        color: #fff;
        font: 14px/54px "?????????";
        overflow: hidden;
    }

    .side ul li img {
        float: left;
    }

    .side ul li .side-top {
        width: 54px;
        height: 54px;
        line-height: 54px;
        display: inline-block;
        background: #444444;
        opacity: 0.8;
        filter: Alpha(opacity=80);
        transition: all 0.3s;
        opacity: 0;
    }