이 CSS 코드의 문제점을 좀 살펴봐 주셨으면 합니다. 채택완료

</p><p><style tyle="text/css">
 #aside {float:left;margin:0 0 0 0;width:180px;font-size:12px;}
 #aside a {display:inline-block;padding:0 10px;height:28px;color:#000;letter-spacing:-0.1em;line-height:2.4em; font-size:12px;}
 #aside a:focus, #aside a:hover, #aside a:active {text-decoration:underline; font-size:12px; color:#FFF; background-color:#900;}
 #focus {text-decoration:underline; font-size:12px; color:#FFF; background-color:#900;}
</style></p><p><div id="aside">
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    <a href="#">
    <div id="focus" style="width:180px;margin-bottom:10px;">About</div></a>
    <a href="#">
    <div style="width:180px;margin-bottom:10px;">Technology</div></a>    
    <a href="#">
    <div style="width:180px;margin-bottom:10px;">Products</div></a>    
    <a href="#">
    <div style="width:180px;margin-bottom:10px;">World of Asia</div></a>   
    <a href="#">
    <div style="width:180px">Contact us</div></a>                      
</div>​</p><p>