body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    width: 100%;
    margin: 0;
    padding: 40px 20px 40px 40px;
    /* 移除背景颜色，允许使用veneer4.html中的背景图片 */
    /* background: #f5f7fa; */
    color: #2c3e50;
    line-height: 1.6;
    position: relative;
    box-sizing: border-box;
}

h3 {
    color: #34495e;
    font-weight: 500;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
}