body { background-image: url('bg.jpg') }
 ol.txt  { font-family: times; font-size: 14; }
 p.txt  { font-family: times; font-size: 14; }
 h1.txt  { font-family: times; }
 div.header { font-family: times; font-size: 14; font-weight: bold}
 div.block { background-color: #FFFFFF ; width: 95%; height:85%; overflow: scroll; 
             margin-left: 15% ; margin-right: 15%; margin-top : 5%; margin-bottom: 5%;}