一般css文件开头要加的

@CHARSET "UTF-8";
*{margin:0;padding:0;}
body {
    color: #2e2e2e;
    font-size: 15px;
}
.clear{clear:both}

.fl{float:left;}.fr{float:right;}
.m10{margin:10px;}.mt5{margin-top:5px;}.mb5{margin-bottom:5px;}.ml5{margin-left:5px; }.ml10{margin-left:10px; }.mr5{margin-right:5px; }
.mr10{margin-right:10px;}.mt10{margin-top:10px;}.mt1{margin-top:1px;}.mt2{margin-top:2px;}
.mt3{margin-top:3px;}.mt4{margin-top:4px;}.mt5{margin-top:5px; }.mt6{margin-top:6px; }.mt7{margin-top:7px; }
.mt8{margin-top:8px; }.mb2{margin-bottom:2px; }.mb3{margin-bottom:3px; }.mb5{margin-bottom:5px; }.mb8{margin-bottom:8px; }.mb10{margin-bottom:10px; }.mb15{margin-bottom:15px; }.mt15{margin-top:15px; }.mt20{margin-top:20px; }