继续学习-拥抱流式布局

今天，继续学习《响应式Web程序设计-HTML5和CSS3实战》。根据昨天的代码进行了修改。边学边改，加入了媒体。

基本步骤就是：

1.将固定的像素元素宽度改为百分比。公式：目标元素宽度 / 上下文元素宽度 = 百分比宽度。

2.将固定的文字像素大小改成等量相对尺寸。使用em。公式：目标元素尺寸 / 上下文元素尺寸 = 百分比尺寸。

3.图像加入width、max-width，使图像平滑缩放。

4.加入媒体查询，不同视口对应不同的字体，布局。

如图，分别是480和768的视口：

480

768

这里就贴css代码了。style.css

body{background-image:url(image/bg4.png);background-repeat:repeat;}img,object,video,embed{max-width:100%;}#wrapper{margin-right:auto;margin-left:auto;width:93.75%;}#header{margin-right:1.06382978%;margin-left:1.06382978%;margin-bottom:40px;width:97.91%;height:200px;background-image:url(image/buntingFW.png);background-repeat:repeat-x;border-bottom:dashed 1px red;}#headline{height:140px;font-size:3em;font-family:Arial;}#headline span{position:relative;top:70px;left:1.06382978%;}#special_hint{color:#aeaeae;}#navigation{background-image:url(image/atwiNavBg.png);background-repeat:repeat-x;height:30px;}#navigation ul{margin:0px;padding:0px;}#navigation ul li{display:inline-block;margin-left:1.06382978%;margin-right:1.06382978%;}#navigation ul li a{text-decoration:none;font-size:1.5625em;font-family:Arial;font-weight:bold;color:black;}#main{overflow:auto;}#siderbar{padding-left:1.06382978%;padding-right:1.06382978%;border-right:solid 3px #eaeaea;width:19.14%;float:left;}#siderbar span{font-size:1.25em;font-family:Arial;font-weight:bold;color:black;clear:both;}#siderbar img{float:left;padding:5.5555555556% 2.777777778%;max-width:43%;}#content{margin-right:1.06382978%;margin-left:1.06382978%;float:right;width:74.46%;font-family:Arial;}#content img{float:left;width:28.9389%;max-width:202px;}#text{float:right;width:68.57%;}#text h1{font-size:4.375em;margin:0px;padding:0px;}#text h2{margin:0px;padding:0px;font-size:2.5em;color:#7F7F7F;}#text span{color:#7F7F7F;font-size:1.125em;line-height:30px;height:30px;}#footer{display:block;margin-right:1.06382978%;margin-left:1.06382978%;margin-top:40px;border-top:dashed 1px red;clear:both;width:97.91%px;height:150px;}#notation{height:80px;text-align:center;padding-top:20px;font-size:0.9375em;color:brown;}#footimg{background-image:url(image/buntingFWinvert.png);background-repeat:repeat-x;height:40px;}@media screen and (min-width:975px) and (max-width:1080px){#navigation ul li a {font-size:1.5625em}}@media screen and (min-width:789px) and (max-width:974px){#navigation ul li a {font-size:1.2625em}}@media screen and (min-width:721px) and (max-width:788px){#navigation ul li a {font-size:1.1em}#text h1{font-size:3.375em;}#text h2{font-size:1.9em;}}@media screen and (min-width:541px) and (max-width:720px){#headline{font-size:1.8em}#navigation ul li a {font-size:0.8em}#siderbar span{font-size:0.9em;}#text h1{font-size:2.575em;}#text h2{font-size:1.12em;}#text span{font-size:0.9em;line-height:15px;}#text a{font-size:0.8em;}#notation{font-size:0.5em;}}@media screen and (max-width:540px){#headline{font-size:1.8em}#navigation ul li a {font-size:0.8em}#siderbar{width:94%;}#siderbar span{font-size:1.8em;}#siderbar img{max-width:100%;}#text h1{font-size:2.575em;}#text h2{font-size:1.12em;}#text span{font-size:0.9em;line-height:15px;}#text a{font-size:0.8em;}#notation{font-size:0.5em;}#siderbar{clear:both;float:none;border-right:none;}#content{clear:both;float:none;}}