常用css

clear float

.clear-fix:before,
.clear-fix:after {
  content: " "; /* 1 */
  display: table; /* 2 */
}

.clear-fix:after {
  clear: both;
}

/**
 * For IE 6/7 only
 * Include this rule to trigger hasLayout and contain floats.
 */
.clear-fix {
  *zoom: 1;
}

box-model fix IE

* {
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}

常用base.css

/*CSS reset*/
body, div, dl, dt, dd, ul, ol, li, h1,h2,h3,h4,h5,h6,pre, form, fieldset, input,textarea, p,blockquote, th, td{margin:0;padding:0;}
table{border-collapse:collapse;border-spacing:0;}
fieldset, img{border:0}
address, caption, cite, code, dfn, em, strong, th, var{font-style:normal;font-weight:normal}
ol, ul{list-style:none}
caption, th{text-align:left}
h1,h2,h3,h4,h5,h6{font-size:100%;font-weight:normal}
q:before, q:after{content:''}
abbr, acronym{border:0}




/*文字排版*/
.f12{font-size:12px}
.f13{font-size:13px}
.f14{font-size:14px}
.f16{font-size:16px}
.f20{font-size:20px}
.fb{font-weight:bold}
.fn{font-weight:normal}
.t2{text-indent:2em}
.lh150{line-height:150%}
.lh180{line-height:180%}
.lh200{line-height:200%}
.unl{text-decoration:underline;}
.tl{text-align:left}
.no_unl{text-decoration:none;}

/*定位*/
.tc{text-align:center}
.tr{text-align:right}
.bc{margin-left:auto;margin-right:auto;}
.fl{float:left;display:inline}
.fr{float:right;display:inline}
.cb{clear:both}
.cl{clear:left}
.cr{clear:right}
.clearfix:after{content:".";display:block;height:0;clear:both;visibility:hidden}.clearfix{display:inline-block}*html
.clearfix{height:1%}.Clearfix{display:block}
.vm{vertical-align:middle}
.pr{position:relative}
.pa{position:absolute}
.abs-right{position:absolute;right:0}
.zoom{zoom:1}
.hidden{visibility:hidden}
.none{display:none}

/*长度高度*/
.w10{width:10px}
.w20{width:20px}
.w30{width:30px}
.w40{width:40px}
.w50{width:50px}
.w60{width:60px}
.w70{width:70px}
.w80{width:80px}
.w90{width:90px}
.w100{width:100px}
.w200{width:200px}
.w250{width:250px}
.w300{width:300px}
.w400{width:400px}
.w500{width:500px}
.w600{width:600px}
.w700{width:700px}
.w800{width:800px}
.w{width:100%}
.h50{height:50px}
.h80{height:80px}
.h100{height:100px}
.h200{height:200px}
.h{height:100%}

/*边距*/
.m10{margin:10px}
.m15{margin:15px}
.m30{margin:30px}
.mt5{margin-top:5px}
.mt10{margin-top:10px}
.mt15{margin-top:15px}
.mt20{margin-top:20px}
.mt30{margin-top:30px}
.mt50{margin-top:50px}
.mt100{margin-top:100px}
.mb5{margin-bottom:5px}
.mb10{margin-bottom:10px}
.mb15{margin-bottom:15px}
.mb20{margin-bottom:20px}
.mb30{margin-bottom:30px}
.mb50{margin-bottom:50px}
.mb100{margin-bottom:100px}
.ml5{margin-left:5px}
.ml10{margin-left:10px}
.ml15{margin-left:15px}
.ml20{margin-left:20px}
.ml30{margin-left:30px}
.ml50{margin-left:50px}
.ml100{margin-left:100px}
.mr5{margin-right:5px}
.mr10{margin-right:10px}
.mr15{margin-right:15px}
.mr20{margin-right:20px}
.mr30{margin-right:30px}
.mr50{margin-right:50px}
.mr100{margin-right:100px}
.p10{padding:10px;}
.p15{padding:15px;}
.p30{padding:30px;}
.pt5{padding-top:5px}
.pt10{padding-top:10px}
.pt15{padding-top:15px}
.pt20{padding-top:20px}
.pt30{padding-top:30px}
.pt50{padding-top:50px}
.pb5{padding-bottom:5px}
.pb10{padding-bottom:10px}
.pb15{padding-bottom:15px}
.pb20{padding-bottom:20px}
.pb30{padding-bottom:30px}
.pb50{padding-bottom:50px}
.pb100{padding-bottom:100px}
.pl5{padding-left:5px}
.pl10{padding-left:10px}
.pl15{padding-left:15px}
.pl20{padding-left:20px}
.pl30{padding-left:30px}
.pl50{padding-left:50px}
.pl100{padding-left:100px}
.pr5{padding-right:5px}
.pr10{padding-right:10px}
.pr15{padding-right:15px}
.pr20{padding-right:20px}
.pr30{padding-right:30px}
.pr50{padding-right:50px}
.pr100{padding-right:100px}