body {
    overflow: hidden;
    background-color: #000;
}

.layui-form .logo {
    margin: 15px 95px;
}

.layui-form-pane {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 400px;
    margin-left: -200px;
    margin-top: -200px;
}

.layui-form-item {
    width: 320px;
    margin: 15px auto;
}

.layui-form-item img.captcha {
    width: 100px;
    height: 36px;
}

.layui-form-item:last-child .layui-btn {
    width: 100%;
    background-color: #fc2f51;
}