body {background-color:#efefef;
  font-family:arial, verdana, sans-serif;
  text-align:center;}

.page {
  margin-left:auto;
  margin-right:auto;
  text-align:left;
  width:700px;
  font-size:12px;
  background-image:url(basic-web-html-09-images-2columnbackground.gif);
  background-repeat:repeat-y;
  border:1px solid #666666;}

.header {
  padding:3px;
  background-color:#ffffff;}

.nav {
  font-weight:bold; 
  padding:5px; 
  float:left; 
  width:100px;}

.content {
  padding:10px;
  margin-left:100px;}