在CSS网页布局开发中，会有很多小技巧，新手朋友往往对此很不熟悉。在某一两个小问题上，或许纠缠很长时间才能搞明白，虽然在的文档中，多次提及过这方面的内容，但依然有很多朋友在这些问题上犯错。-CSS page layout in the development, there will be many small skills, new friends are often not familiar with this. In one or two minor issues, perhaps a long time to engage in the struggle to understand, although the document makes frequent references in this area, but still have many friends on these issues, make mistakes.