body {
    background: #E4E4E4;
}
.under .login-btn {
    top: 9.44%;
    left: 5.3125%;
}
.under .content {
    width: 335px;
}
.under .under_logo {
    width: 100%;
}
.under .under_logo img {
    width: 100%;
}
.under .under_contact {
    margin-top: 52px;
}
.under .line {
    width: 58.625%;
    height: 1px;
    background: #ABABAB;
    margin-left: 6px;
}

.under .author-sign {
    position: absolute;
    left: calc(50% - 46.55px);
    bottom: 20.14px;
}

.under .under_name {
    margin-top: 28px;
}

@media (max-width: 768px) {
    .under .author-sign {
        position: absolute;
        left: calc(50% - 15px);
        bottom: 20.14px;
    }
    .under .content {
        max-width: calc(100% / 5* 3);
    }
    .under .under_contact {
        margin-top: 23px;
    }
}