*{ margin: 0; padding:0 ;}
.main{ width:800px;height: 150px;position: relative;margin: 30px auto;}
.box{ width: 100px; height: 100px;margin-left:20px; float: left;}
.one1{width: 0; height: 0;
/*border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-bottom: 100px solid red;*/
border-style: solid;
border-width: 20px;
border-color: transparent transparent #f60 transparent !important;}
.one2{width: 0; height: 0; border-style: solid;border-width: 20px;
border-color:#f60 transparent transparent transparent !important;}
.one3{width: 0; height: 0; border-style: solid;border-width: 20px;
border-color: transparent #f60 transparent transparent !important;}
.one4{width: 0; height: 0; border-style: solid;border-width: 20px;
border-color: transparent transparent transparent #f60 !important;}
一个很好的三角形图标效果 css 网页制作中经常会用的到