小箭头图：
HTML代码：
<div class="pre-wrap"> <div class="pre"> <div class="pre1"></div> <div class="pre2"></div> </div> </div>
CSS代码：
.pre-wrap {
width: 200px;
height: 120px;
margin: 50px auto 0;
border: 2px solid #F00;
border-radius: 4px;
position: relative;
}
.pre {
width: 80px;
height: 80px;
position: absolute;
top: 20px;
left: 40px;
}
.pre1 {
border-width: 40px;
border-color: transparent #F30 transparent transparent;
}
.pre2 {
border-width: 40px;
border-color: transparent #FFF transparent transparent;
position: relative;
top: -80px;
left: 15px;
}
.pre1, .pre2 {
/*****设置border-style:dashed;使ie6支持border透明*****/
border-style: dashed solid dashed dashed;
/*****设置容器宽高为0*****/
width: 0;
height: 0;
/*****去掉ie6下默认高度，设置以下属性*****/
line-height: 0;
font-size: 0;
overflow: hidden;
}
小箭头
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