分享这个base.css原子框架样式

@charset "utf-8";
/*!
 * Created by haley on 2016/6/16.
 * @名称：base.css
 * @功能：1、重设浏览器默认样式
 *       2、设置通用原子类
 */
/* 防止用户自定义背景颜色对网页的影响，添加让用户可以自定义字体 */
html {
  background:white;
  color:black;
}
/* 内外边距通常让各个浏览器样式的表现位置不同 */
body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,textarea,p,blockquote,th,td,hr,button,article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section {
  margin:0;
  padding:0;
}
/* 要注意表单元素并不继承父级 font 的问题 */
body,button,input,select,textarea {
  font-size:12px ;
  font-family:arial,sans-serif;
  line-height: 12px;
}
input,select,textarea {
  font-size:100%;
}
/* 去掉 table cell 的边距并让其边重合 */
table {border-collapse:collapse;border-spacing:0;}
/* ie bug：th 不继承 text-align */
th {text-align:inherit;}
/* 去除默认边框 */
fieldset,img { border:none; }
/* ie6 7 8(q) bug 显示为行内表现 */
iframe {display:block;}
/* 去掉 firefox 下此元素的边框 */
abbr,acronym {
  border:none;
  font-variant:normal;
}
/* 一致的 del 样式 */
del {
  text-decoration:line-through;
}
address,caption,cite,code,dfn,em,th,var {
  font-style:normal;
  font-weight:500;
}
/* 去掉列表前的标识，li 会继承 */
ol,ul {
  list-style:none;
}
/* 对齐是排版最重要的因素，别让什么都居中 */
caption,th {
  text-align:left;
}
/* 来自yahoo，让标题都自定义，适应多个系统应用 */
h1,h2,h3,h4,h5,h6 {
  font-size:100%;
  font-weight:500;
}
q:before,q:after {
  content:'';
}
/* 统一上标和下标 */
sub,sup {
  font-size:75%;
  line-height:0;
  position:relative;
  vertical-align:baseline;
}
sup {
  top:-0.5em;
}
sub {
  bottom:-0.25em;
}
/* 让链接在 hover 状态下显示下划线 */
a:hover {
  text-decoration:underline;
}
/* 默认不显示下划线，保持页面简洁 */
ins,a {
  text-decoration:none;
}
/* 去除 ie6 & ie7 焦点点状线 */
a:focus,*:focus {
  outline:none;
}
/* 清除浮动 */
.clearfix:before,.clearfix:after {
  content:"";
  display:table;
}
.clearfix:after {
  clear:both;
  overflow:hidden;
}
.clearfix {
  zoom:1; /* for ie6 & ie7 */
}
.clear {
  clear:both;
  display:block;
  font-size:0;
  height:0;
  line-height:0;
  overflow:hidden;
}
/* 设置显示和隐藏，通常用来与 js 配合 */
.hide {
  display:none;
}
.block {
  display:block;
}
/* 设置浮动，减少浮动带来的 bug */
.fl,.fr {
  display:inline;
}
.fl {
  float:left;
}
.fr {
  float:right;
}

.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;}
.no_unl{text-decoration:none;}

.tl{text-align:left;}
.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%}
.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;}

.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;}
.w300{width:300px;}
.w400{width:400px;}
.w500{width:500px;}
.w600{width:600px;}
.w700{width:700px;}
.w800{width:800px;}
.w{width:100%}
.h{height:100%}
.h50{height:50px;}
.h80{height:80px;}
.h100{height:100px;}
.h200{height:200px;}

.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;}
.pt100{padding-top:100px;}
.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;}

使用中的代码

@charset "utf-8";
html {background:white;color:black;}
body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,code,form,fieldset,legend,input,textarea,p,blockquote,th,td,hr,button,article,aside,details,figcaption,figure,footer,header,hgroup,menu,nav,section {margin:0;padding:0;}
body,button,input,select,textarea {font-size:12px ;font-family:arial,sans-serif;line-height: 12px;}
input,select,textarea {font-size:100%;}
table {border-collapse:collapse;border-spacing:0;}
th {text-align:inherit;}
fieldset,img { border:none; }
iframe {display:block;}
abbr,acronym {border:none;font-variant:normal;}
del {text-decoration:line-through;}
address,caption,cite,code,dfn,em,th,var {font-style:normal;font-weight:500;}
ol,ul {list-style:none;}
caption,th {text-align:left;}
h1,h2,h3,h4,h5,h6 {font-size:100%;font-weight:500;}
q:before,q:after {content:'';}
sub,sup {font-size:75%;line-height:0;position:relative;vertical-align:baseline;}
sup {top:-0.5em;}
sub {bottom:-0.25em;}
a:hover {text-decoration:underline;}
ins,a {text-decoration:none;}
a:focus,*:focus {outline:none;}
.clearfix:before,.clearfix:after {content:"";display:table;}
.clearfix:after {clear:both;overflow:hidden;}
.clearfix {zoom:1; /* for ie6 & ie7 */}
.clear {clear:both;display:block;font-size:0;height:0;line-height:0;overflow:hidden;}
.hide {display:none;}
.block {display:block;}
.fl,.fr {display:inline;}
.fl {float:left;}
.fr {float:right;}
.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;}
.no_unl{text-decoration:none;}
.tl{text-align:left;}
.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%}
.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;}

.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;}
.w300{width:300px;}
.w400{width:400px;}
.w500{width:500px;}
.w600{width:600px;}
.w700{width:700px;}
.w800{width:800px;}
.w{width:100%}
.h{height:100%}
.h50{height:50px;}
.h80{height:80px;}
.h100{height:100px;}
.h200{height:200px;}

.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;}
.pt100{padding-top:100px;}
.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;}