DIV+CSS网页布局技巧实例1：设置网页整体居中的代码
以前用表格布局时设置网页居中非常方便，把表格对齐方式设置为居中就行了，就这么简单，现在呢，用DIV+CSS样式表控制，好像不是那么容易了，其实也很简单，只不过方式不同而已。
请看这段代码，宽度为适合800×600分辨率浏览器的宽度，margin:0 auto; 这句代码就是让居中了，意思是外边距上下设置为0，左右设为自动。这样它就居中了。
那么可能你要问了，text-align:center;为什么还要让内容居中呢？呵呵，别着急，这句是为了适应IE6以下版本的浏览器而加的，IE6以下对margin:0 auto;不能解析为居中，所以用这种方式来补救，以下在设计内容时再用 text-align:left;就可以了。
注：margin和padding的值的顺序为顺时针上右下左，如margin:1px 2px 3px 4px;还可以缩写为上下、左右，如本例，如果为margin:0px;则是各边都为0
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