.bg {
background: url(images/title_bg.jpg);
filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=‘scale‘)";
-moz-background-size: 100% 100%;
background-size: 100% 100%;
height: 150px;
}
<div class="bg">
<img src="images/temp.png" style="width: 100px; height: 100px; border-radius: 50%; margin-top: 30px; margin-left: 20px" alt="头像" />
</div>
原文：http://www.cnblogs.com/linyijia/p/4503158.html