.form-group {
    max-width: 400px;
    margin: 50px auto;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    background: #fff;
}

.title {
    text-align: center;
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 20px;
    color: #333;
}

.error-message {
    color: #ff4d4f;
    background: #fff2f0;
    border: 1px solid #ffccc7;
    border-radius: 4px;
    padding: 10px;
    margin-bottom: 15px;
    text-align: center;
}

.demo-login-container {
    padding: 20px 0;
}

.layui-form-item {
    margin-bottom: 20px;
}

.layui-input {
    height: 45px;
    border-radius: 4px;
}

.layui-btn {
    width: 100%;
    height: 45px;
    margin-bottom: 15px;
    border-radius: 4px;
}

.layui-btn-primary {
    background: #f0f0f0;
}

.layui-input-prefix {
    line-height: 45px;
}