#menu {
    position: fixed;
    bottom: 0px;
    width: 100%;
    height: 60px;
    line-height: 60px;
    z-index: 999;
    background-color: #2b303b;
    font-family: "微软雅黑";
}
#menu ul {
    margin: 0 auto;
    list-style-type: none;
    width: 100%;
    max-width: 500px;
    height: 100%;
}
#menu ul li {
    float: left;
    width: 33%;
    height: 100%;
    text-align: center;
    position: relative;
    font-size: 16px;
    line-height: 60px;
}