摘要：
全部代码:meta charset="utf-8" /style html, body { width: 100%; height: 100%; margin: 0; padding: 0; border: 0; }div { margin: 0; padding: 0; border: 0; }.nav { position: absolute; top: 0; left: 0; width: 100%; height: 27px; background-color: white; color: black; text-align: center; line-height: 25px 阅读全文
