为什么计算宽度计算网页像素宽度是为了CSS网页布局整齐与兼容。常见的我们布局左右结构网页或使用padding、margin布局的时候将计算整页宽度，如果不计算无论是宽度过大过小就会出现错位问题。怎么计算CSS宽度例一：我们计算一个左右结构的布局样式。假如总宽度为400px，那么左右加起来就应当小于400px，那我们可能左边为300px，右边为100px正确代码：
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