body {
    background-color: #f2f2f2;
}

.register-main {
    width: 500px;
    margin: 100px auto;
    background-color: #fff;
    padding: 20px 30px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.register-main header {
    font-size: 22px;
    font-weight: bold;
    text-align: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}

.layui-form-item .layui-input-block {
    margin-left: 110px;
}

.layui-form-item .layui-form-label {
    width: 140px;
}

@media screen and (max-width: 768px) {
    .register-main {
        width: 90%;
        margin: 50px auto;
    }

    .layui-form-item .layui-input-block {
        margin-left: 0;
    }

    .layui-form-item .layui-form-label {
        width: auto;
    }
}