摘要:
<style>body {background:#ccc;}#box {width:200px;position:relative;}.content {width:180px;position:relative;z-index:1;}.bg {width:200px;background:red; 阅读全文
摘要:
position:fix固定定位 position:fix固定定位 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"><html xmlns="http://www.w3.org/1999/xhtml"><head><met 阅读全文