我是這樣寫，有問題么？？會(huì)不會(huì)產(chǎn)生副作用
/*在此定義相關(guān)CSS樣式*/
.topList {
??? width:300px;
??? height:180px;
??? border:1px solid #E8E8E8;
??? margin:0 auto;
}
ul{
??? list-style-type: none;
??? padding: 0 5px 5px 5px;
??? font-size:12px;
}
?em{
??? width:20px;
??? height:16px;
??? text-align:center;
??? font-style:normal;
??? color:#333;
??? background:url("http://img1.sycdn.imooc.com//53cf0fa20001d3dc00200032.jpg") no-repeat ;
??? background-position:0 -16px;
??? display:block;
??? float:left;
}
.top em{
??? color:#FFF;
??? background:url(http://img1.sycdn.imooc.com//53cf0fa20001d3dc00200032.jpg) no-repeat top? center;
}
.topList a:link,.topList a:visited{
??? text-decoration: none;
?? ?color: #888;
}
.topList a:hover,.topList a:active{
??? text-decoration: none;
?? ?color: #F00;
}
2019-02-15
background-position:0 -16px;
這里改為:
background-position:bottom center;