@media screen and (max-width: 750px) {
    .m-step-wrapper {
        background: #4475B7;
        padding: 0 .3rem;
        min-height: calc(100vh - .88rem);
        overflow-x: hidden;
    }
    .m-step-nav-box {
        overflow-x: auto;
    }
    .m-step-wrapper .m-step-nav-cont {
        display: flex;
        flex-wrap: nowrap;
        width: 170%;
        margin: .2rem 0;
    }
    .m-step-wrapper .m-step-nav-cont li {
        padding: 0 .42rem;
        background: rgba(255, 255, 255, .4);
        border-radius: .4rem;
        margin: 0 0.03rem;
        font-size: .28rem;
        height: .8rem;
        line-height: .8rem;
    }
    .m-step-wrapper .m-step-nav-cont li:last-child {
        line-height: inherit
    }
    .m-step-wrapper .m-step-nav-cont li span {
        display: block;
    }
    .m-step-wrapper .m-step-nav-cont li.active {
        background: #10A8EE;
    }
    .m-step-wrapper .m-step-box {
        margin-top: 1.35rem;
        padding-bottom: 2rem;
        position: relative;
    }
    .m-step-wrapper .m-step-box .m-step-cont{
        position: relative;
        left: 1rem;
    }
    .m-step-wrapper .m-step-box .m-step-cont::after {
        content: "";
        position: absolute;
        top: -1.2rem;
        left: -1.2rem;
        width: 1.5rem;
    }
    .m-step-wrapper .m-step-box .m-step-cont-1::after{
        height: 25rem;
        background: url(../images/relatedActivities/line_1.png) no-repeat;
        background-size: 100% 100%;
    }
    .m-step-wrapper .m-step-box .m-step-cont-2::after {
        height: 10rem;
        background: url(../images/relatedActivities/line_2.png) no-repeat;
        background-size: 100% 100%;
    }
    .m-step-wrapper .m-step-box .m-step-cont-3::after {
        height: 6.5rem;
        background: url(../images/relatedActivities/line_3.png) no-repeat;
        background-size: 100% 100%;
    }
    .m-step-wrapper .m-step-box .m-step-cont-4::after {
        height: 7.2rem;
        background: url(../images/relatedActivities/line_4.png) no-repeat;
        background-size: 100% 100%;
    }
    .m-step-wrapper .m-step-box .m-step-item-box {
        width: 6rem;
    }
    .m-step-wrapper .m-step-box .m-step-item-box .m-step-item {
        position: relative;
        height: 3.43rem;
        background: rgba(0, 0, 0, .1);
        margin-bottom: .2rem;
    }
    .m-step-wrapper .m-step-box .m-step-item-box .m-step-item::before {
        content: "";
        position: absolute;
        left: -1rem;
        width: 1rem;
        height: .6rem;
        z-index: 2;
        background: url(../images/relatedActivities/line_tl.png) no-repeat;
        background-size: 100% 100%;
    }
    .m-step-wrapper .m-step-box .m-step-item-box .m-step-item.is-active::before {
        background: url(../images/relatedActivities/line_tl_hov.png) no-repeat;
        background-size: 100% 100%;
    }
    .m-step-wrapper .m-step-box .m-step-item-box .m-step-item .m-step-item-cont {
        display: flex;
        padding: .3rem .15rem;
    }
    .m-step-wrapper .m-step-box .m-step-item-box .m-step-item .m-step-item-img {
        width: 2rem;
        height: 2.83rem;
    }
    .m-step-wrapper .m-step-box .m-step-item-box .m-step-item .m-step-item-img img {
        display: block;
        width: 100%;
    }
    .m-step-wrapper .m-step-box .m-step-item-box .m-step-item .m-step-item-info {
        position: relative;
        flex: 1;
        margin-left: 0.15rem;
    }
    .m-step-wrapper .m-step-box .m-step-item-box .m-step-item .m-step-item-info h3 {
        font-size: .26rem;
        font-weight: 700;
    }
    .m-step-wrapper .m-step-box .m-step-item-box .m-step-item .m-step-item-info p {
        margin-top: .2rem;
        font-size: .18rem;
        line-height: .3rem;
    }
    .m-step-wrapper .m-step-box .m-step-item-box .m-step-item .m-step-item-info .pdf-download {
        position: absolute;
        bottom: 0;
        width: 2rem;
        height: .48rem;
        font-size: .26rem;
        line-height: .48rem;
        text-align: center;
        background: #00ACEE;
    }
    .m-step-wrapper .m-step-box .m-step-item-box .m-step-item .m-step-item-info .pdf-download img {
        position: relative;
        display: inline-block;
        width: .3rem;
        height: .3rem;
        top: .08rem;
    }
    .m-step-wrapper .back_map {
        margin: 0 auto;
        width: 3.3rem;
        height: .88rem;
        font-size: .34rem;
        font-weight: 800;
        line-height: .88rem;
        text-align: center;
        border-radius: .44rem;
        margin-bottom: .5rem;
        background: rgba(255, 255, 255, .3);
    }
}