<style>
.u-progress {
height: 25px;
background: #CBCBCB;
position: relative;
border-radius: 3px;
box-shadow: inset 0 1px 1px rgba(0,0,0,0.1);
overflow: hidden;
margin-bottom: 4px;
}
.u-progress .pgbar, .u-progress .pging {
display: block;
width: 100%;
height: 100%;
border-radius: 3px;
}
.u-progress .pging {
background: #FF3B23;
}
</style>
<p class="u-progress">
<span class="pgbar" style="width:42%;">
<span class="pging"></span>
</span>
</p>
原文：http://www.cnblogs.com/rickons/p/5478611.html