html, body {   
   width:100%;   
   height:100%;   
   border:0px;
   margin:0px;
   font-family:arial;   
   color:#000000;      
   }
   
.viewport_gesamt {
  width:100%;   
  height:100%;  
  background: #fff3e0;
  overflow-y: hidden;
}

.seite {      
  height:91%;
  overflow-y: auto;
  padding: 8px;
  text-align:center;
  font-style:italic;  
  font-size:4.6vmin;
}