이 CSS 코드의 문제점을 좀 살펴봐 주셨으면 합니다.

<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><div id="aside">    <div style="font-size:18px;font-weight:bold;margin-bottom:15px;width:180px">About</div>    <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>​