#main-banner{
    overflow: auto;
    .banner{
        width: 375px;
        height: 183px;
        background: url("https://julyedu-cdn.oss-cn-beijing.aliyuncs.com/active19_1111/m/banner.png") no-repeat;
        background-size: contain;
    }
    .formal_banner {
        background: url("https://julyedu-cdn.oss-cn-beijing.aliyuncs.com/active19_1111/m/formal_banner.png") no-repeat;
        background-size: contain;
    }
    #main-nav{
        position: absolute;
        top: 183px;
        width: 100%;
        margin-bottom:30px;

        &.fixed{
            position: fixed;
            top: 0;
            z-index: 100;
        }
        ul{
            background: #3900C9;
            display: flex;
        }
        li{
            flex: 1;
            width: 63px;
            height: 40px;
            font-size: 11px;
            color: #fff;
            text-align: center;
            line-height: 40px;
            &.active{
                background: #FF42F9;
            }
        }
    }
}
