* { margin:0px; padding:0px; text-decoration:none; list-style-type:none; } #tree { height:500px; width:200px; border:1px solid red; font-size:20px; } #tree > ul li { margin-left:40px; } .bgplus { float:left; background-image:url("http://www.jq22.com/img/cs/500x300-9.png"); height:9px; width:9px; margin-top:8px; } .bgminus { float:left; background-image:url("ihttp://www.jq22.com/img/cs/500x300-8.png"); height:9px; width:9px; margin-top:8px; } .bgpage { float:left; background-image:url("ihttp://www.jq22.com/img/cs/500x300-7.png"); height:9px; width:9px; margin-top:8px; } span { border:1px solid red; }