css reset 的总结
*{margin:0; padding:0;box-sizing:border-box;}
*::before{box-sizing: border-box;}
*::after{box-sizing:border-box;}
ul,ol{list-style:none;}
h1,h2,h3,h4,h5,h6{ font-weight:normal;}
a{text-decoration: none;color:inherit;}
img {vertical-align: top;}
input,button{border: none;outline: none;}
.icon {width: 1em; height: 1em;vertical-align: -0.15em;fill: currentColor;overflow: hidden;}
body{font:15px/1.5 Helvetica,sans-serif;color:#333; background: #FBFCFD; ;}
.clearfix{ content:''; display:block; clear:both;}
（.noCollapse::before{content:'';display:table;}
.noCollapse::after{content:'';display:table;}）
