body {
    margin: 0;
    padding: 0;
}

.sign {
    width: 480px;
    background: rgba(255, 255, 255, 1);
    box-shadow: -3px 20px 59px 0px rgba(200, 200, 200, 0.45);
    border-radius: 10px;
}

.img-box {
    display: flex;
    justify-content: center;
    margin-top: 10px;
}

.top {
    display: flex;
    justify-content: space-between;
}

a {
    font-size: 15px;
    font-family: Source Han Sans CN;
    font-weight: 400;
    color: rgba(153, 153, 153, 1);
    line-height: 30px;
    text-decoration: none;
}

.com {
    margin: 0 auto;
}

.ipt {
    width: 355px;
    height: 40px;
    background: rgba(255, 255, 255, 1);
    border: 2px solid rgba(231, 231, 231, 1);
    font-size: 16px;
    font-family: Source Han Sans CN;
    font-weight: 400;
    color: rgba(153, 153, 153, 1);
    line-height: 30px;
    padding-left: 20px;
}

.cont {
    margin: 20px 50px;
}

.cont2 {
    margin: 20px 50px;
}

.btm {
    width: 300px;
    height: 50px;
    background: rgba(54, 158, 255, 1);
    box-shadow: 0px 3px 9px 0px rgba(76, 135, 224, 0.4);
    border-radius: 38px;
    text-align: center;
    line-height: 55px;
    margin: 25px auto 15px auto;
    cursor: pointer;
}

    .btm a {
        font-size: 20px;
        font-family: Source Han Sans CN;
        font-weight: 400;
        color: rgba(255, 255, 255, 1);
    }