1.CSS教程：：CSS教程|菜鸟教程(runoob.com)2.CSS布局思路1.盒子模型1.1外边距margin上右下左1.2内边距padding 上右下左1.3边框border 上右下左1.4阴影box-shadow:h-shadowv-shadowblurspreadcolorinset;(box-shadow:0010px-2pxrgba(0,0,0,5);)1