#container {
 border-left: 1px solid black; border-right: 1px solid black;
 padding: 0; margin: 0;
 width: 800px;  max-width: 100%;
 background-color: #dddddd;
 background: url(main-bg.jpg) 0 0 repeat-y;
 text-align: center;
}

#mainframe {
 padding: 0; margin: 0 20px 0 20px;
 text-align: justify;
}
img { max-width: 100%; }