* { box-sizing:border-box; }
#pagebody{               width:80%;  min-width:500px; border:solid 1px black;  background-color:white;  margin:0 auto; padding:0;   }
#header  {               width:100%; height:80px;     border-bottom:solid 1px black;  padding:0.5em; }
#submenu { float:left;   width:40%;  height:400px;    border-right:solid 1px black;   padding:0.5em; }
#content { float:right;  width:60%;  height:400px;                                    padding:0.5em; }
#footer  { clear:both;   width:100%; height:40px;     border-top:solid 1px black;     padding:0.5em; }