html页面公共样式: body, div, ul, li, h1, h2, h3, h4, h5, h6, p, dl, dt, dd, ol, form, input, textarea, th, td, select { margin: 0; padding: 0; } * { box-sizing: border-box; } table{ border-collapse:collapse; } body { font-family: Microsoft YaHei; } ul, l