margin:0px;
简写：margin:0;
3)字体
4)背景 background-color:red;
background-image:url();
background-repeat:no-repeat;
baclgrpimd-position:top right;
background-attachment:fixed;
(每个属性都可省略)简写：background:background-color background-image background-repeat background-position background-attachment;
5)内外边距(margin与padding简写方式相同)
6)边框
border-width:1px;
border-style:solid;
border-color:red;
简写：border:border-width border-style border-color;
border:1px solid red;
单边简写：border-top:1px solid red;
border-right:1px solid red;
border-bottom:1px solid red;
border-left:1px solid red;
(不推荐)单属性简写：(顺序：上右下左)
border-width:border-top-width border-right-width border-bottom-width border-left-width;
border-style:border-top-style border-right-style border-bottom-style border-left-style;
border-color:border-top-color border-right-color border-bottom-color border-left-color;