main.css

*{
  margin:0;
  padding:0;
  }
 h1{
   font:bold 20px tahoma;
   }
   h2{
   font:bold 14px tahoma;
   }
   hgroup,header,nav,section,article,aside,footer{
   diplay:block;
   }
body{
   text-align:center;
   }
#wrapper1{
  border:1px solid black;
  width:1000px;
  margin:20px auto;
  text-align:left;
  }
#top_header{
 background-color:yellow;
 border:1px solid blue;
 padding:20px;
 }
 #top_menu{
 background-color:blue;
 color:white;
 }
 #top_menu li{
 list-style:none;
 display:inline-block;
 font: bold 14px tahoma;
 padding:5px;
 }
 #main{
 float:left;
 width:660px;
 margin:30px; /*720px used & 280px remaning*/
 }
 #ads{
 float:left;
 width:220px;
 margin:20px 0px;
 padding:20px;
 background-color:#66CCCC;
 }
 #the_footer{
 clear:both;
 text-align:center;
 padding:20px;
 border-top:2px solid green;
 }
 article{
 background-color:#ccffcc;
 border:1px solid red;
 padding:20px;
 margin-bottom:15px;
 }
 article footer{
 text-align:right;
 }