/* 简单重置，避免不同浏览器差异 */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; font-family: -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif; }
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul,li { list-style: none; }
body { background:#ffffff; }