@media screen and (max-width: 750px) {

    html,
    body,
    #all_con,
    #top_con,
    #top_con2 {
        min-width: 100vw;
        width: 100vw;
    }

    .inner_con,
    #contentBox {
        width: calc(100vw - 0.48rem);
        min-width: calc(100vw - 0.48rem);
    }

    #top_con {
        padding-top: 0.7rem;
        background: url("../img/top_banner_m.png") no-repeat top;
        background-size: cover;
    }

    #top_con2 {
        padding-top: 0.6rem;
        background: url("../img/top_banner2_m.png") no-repeat top;
        background-size: cover;
        height: 2.8rem;
    }

    #top_con2 .inner_con {
        display: none;
    }

    footer#bot {
        padding: 0.4rem 0;
        height: 2.1rem;
    }

    footer#bot #beFrom {
        font-size: 0.2rem;
    }

    footer#bot #beFrom span {
        display: block;
        margin: 0;
    }

    footer#bot #beFrom span:first-child {
        margin-bottom: 0.14rem;
    }

    #footImg img {
        margin-top: 0.2rem;
        width: 1.6rem;
    }

    #line,
    #introductoryInnerText {
        width: calc(100vw - 0.48rem);
    }

    #top_con .br_m {
        display: block;
        line-height: 0;
        margin-top: 0.2rem;
    }

    #text {
        font-size: 0.3rem;
        margin-bottom: 0.24rem;
        font-weight: 600;
    }

    #timeT {
        font-size: 0.6rem;
        margin-bottom: 0.24rem;
    }

    #timeT strong {
        display: block;
        margin-bottom: 0.2rem;
    }

    #line {
        height: 0.02rem;
    }

    #time3 {
        padding-left: 0.1rem;
        margin-top: 0.24rem;
        font-size: 0.24rem;
    }

    #time3 span:last-child {
        margin-left: 0.6rem;
    }

    #introductory {
        margin-top: 0.9rem;
        text-align: center;
        font-size: 0.36rem;
        color: #2353c4;
    }

    #introductoryInnerText {
        padding: 0.4rem 0.4rem 0.5rem;
        font-size: 0.24rem;
        font-weight: 600;
        background-color: rgba(255, 255, 255, 0.7);
        height: auto;
        width: 5.5rem;
        margin: 0 auto;
        margin-top: 0.3rem;
    }

    #introductoryInnerText p {
        line-height: 0.58rem;
    }

    #introductoryInnerText #toMore {
        display: none;
    }

    #toMore {
        position: initial;
        bottom: auto;
        right: auto;
        margin: 0 auto;
        display: block;
        margin-top: 0.7rem;
        width: 3.2rem;
        height: 0.6rem;
        line-height: 0.6rem;
        text-align: center;
        font-size: 0.3rem;
        color: #fff;
        background: #f17c5c;
        border-radius: 0.6rem;
    }

    #menu {
        display: block;
        position: absolute;
        top: 0.64rem;
        right: 0.62rem;
        width: 0.39rem;
        height: 0.35rem;
    }

    #nav_box {
        display: none;
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        background: rgba(0, 0, 0, 0.7);
        z-index: 9999;
    }

    #nav {
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        min-width: 2.6rem;
        width: 2.6rem;
        height: 100%;
        background-color: #fff;
        padding-top: 1.6rem;
        padding-left: 0.4rem;
    }

    #nav a {
        display: block;
        margin-bottom: 0.7rem;
        font-size: 0.3rem;
        padding: 0;
        text-align: left;
    }

    #close {
        display: block;
        position: absolute;
        top: 0.64rem;
        right: 0.4rem;
        width: 0.36rem;
    }

    #textBox {
        background-color: #fff;
    }

    #contentBox {
        min-height: calc(100vh - 5.2rem);
        padding-bottom: 0.3rem;
        margin: 0 auto 0.3rem;
    }

    #contentBox h1 {
        margin: 0.5rem 0;
        font-size: 0.42rem;
    }

    .content-main p {
        font-size: 0.2rem;
    }

    .studyBox {
        padding: 0 0.2rem;
    }

    .studyBox .study {
        width: 100%;
        height: auto;
    }

    .studyBox .study .video {
        width: 100%;
        height: auto;
    }

    .studyBox .study .video video {
        width: 100%;
        height: auto;
    }

    .studyText {
        margin-left: 0;
        width: 100%;
        font-size: 0.24rem;
        margin-top: 0.6rem;
    }

    .studyLink {
        margin: 0.5rem auto 0;
        height: 0.6rem;
        line-height: 0.6rem;
        width: 3.3rem;
        border-radius: 0.6rem;
        font-size: 0.24rem;
    }

    .coming {
        margin-top: 1rem;
    }

    .file {
        font-size: 0.18rem;
    }

    .content-main table td {
        font-size: 0.2rem;
        padding: 0.05rem 0.07rem;
    }

    .tr {
        margin-top: 0.1rem;
    }

    #contentBox ul {
        margin-bottom: 0.5rem;
    }

    #contentBox li {
        padding: 0.1rem 0;
        font-size: 0.24rem;
    }

    #contentBox li .text_con {
        width: calc(100% - 2rem);
        text-align: left;
        font-size: 0.24rem;
    }
}