id选择器前没加#

tlekktcfmcrfhsipzhyoiybcnookmevyfcvbswmscqefwitxeoocibgrufbmqtrshyrcjfkmjgavjogsmnwpawpwfygykwqvqqtbtxiyowgpitogwuwfllaamnhlmjcylexohnzgxfapirtbwfrpofkfzslcdunw

<style type="text/css">
*{margin:0; padding:0;}
#wrap{width:970px; margin:0 auto;}
#mainbody{position:relative; margin-top:15px;}
#left{border:1px solid #999;width:110px; }
#mid{position:absolute;top:0;width:650px;border:1px solid #999;margin-left:120px;}
#right{position:absolute;top:0;margin-left:780px;border:1px solid #999;}
</style>

<style type="text/css">

*{margin:0; padding:0;}

#wrap{width:970px; margin:0 auto;}

#mainbody{position:relative; margin-top:15px;}

#left{float:left;width:110px; }

#mid{float:left;width:650px;border:1px solid #999;margin-left:13px;}

#right{position:absolute;border:1px solid #999;left:790px;}

</style>