css <div id="hengxian">飞</div> 里面写字背景图片才显示，不下东西他不显示，怎么叫他里面不写也显示图

Question

#hengxian
{
background-image:url("../IMAGES/hengxian2.jpg");
}
<div id="hengxian">.</div>

Answer 1

设上个宽和高width,height