CSS相关知识
1. CSS是一种为结构化文档添加样式的计算机语言
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使用场景1：一种样式重复使用。Do not Repeat Yourself.
使用场景2：简化网页设计
如：
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? h1.css
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2 css
<div id="container"> <div id="header"> <h1>When You Are Old</h1> </div> <div id="mainbody"> <div id="sidebar"> <p><br><br>index</p> <p>download</p> <p>William Yeats</p> <p>Contact Me</p> </div> <div id="content"> <pre> When you are old and grey and full of sleep, And nodding by the fire, take down this book, And slowly read, and dream of the soft look Your eyes had once, and of their shadows deep; How many loved your moments of glad grace, And loved your beauty with love false or true, But one man loved the pilgrim Soul in you, And loved the sorrows of your changing face; And bending down beside the glowing bars, Murmur, a little sadly, how Love fled And paced upon the mountains overhead And hid his face amid a crowd of stars. </pre> </div> </div> <div id="foot"> <hr> <a href="mailto:renw1990@gmail.com">My Email</a> </div></div>?ps：
http://www.w3school.com.cn/
http://www.csszengarden.com/tr/chinese/
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