@media screen and (max-width:900px) {
    .ct1 {
        width: 100%;
        padding-top: 60px;
    }

    .ct2 {
        width: 90%;
        padding-bottom: 20px;
    }

    .txt2 {
        font-size: 36px;
        line-height: 36px;
        text-align: center;
        padding-bottom: 10px;
    }

    .txt3 {
        font-size: 24px;
        line-height: 32px;
    }

    .ct3 .left {
        background-size: auto;
        background-position: center bottom;
    }

    .ct3 .right {
        background-size: auto;
        background-position: center bottom;
    }

    .ct4 {
        display: table;
        width: 90%;
        margin: auto;
        padding-top: 16px;
    }

    .txt4 {
        font-size: 20px;
        line-height: 26px;
        font-weight: 500;
    }

    .ct5 {
        height: 320px;
    }

    .ct6 {
        height: 320px;
    }
}