.bar_img {
    width: 150px;
    height: 150px;
    margin-left: 80px;
    background-image: url('../imgs/index/bar_33.png');
    background-repeat: no-repeat;
    background-size: 100% 100%;
    position: fixed;
    bottom: 50vh;
    z-index: 9999;
    display: none;
}
.layui-fixbar {
    width: 20%;
}
.layui-fixbar li {
    width: 70px;
    height: 70px;
    line-height: 70px;
    margin-bottom: 1px;
    text-align: center;
    cursor: pointer;
    font-size: 30px;
    background-color: black;
    color: #fff;
    border-radius: 2px;
    opacity: .95;
    display: none
}

.layui-fixbar-top {
    display: none;
    font-size: 40px;
    background-color: #f57f1c;
}

.layui-fixbar {
    position: fixed;
    left: 15px;
    bottom: 50vh;
    z-index: 9999;
}

.li1 {
    background-image: url('../imgs/index/bar_1.png');
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

.li2 {
    background-image: url('../imgs/index/bar_2.png');
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

.li3 {
    background-image: url('../imgs/index/bar_3.png');
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

.li4 {
    background-image: url('../imgs/index/bar_4.png');
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

.li2:hover {
    background-image: url('../imgs/index/bar_22.png');
    background-repeat: no-repeat;
    background-size: 100% 100%;
    width: 150px;
    height: 70px;
    line-height: 70px;
}

.li3:hover .bar_img {
    display: block;
}