html, body {
	width: 100%; 
	height: 100%;
	margin: 0;
	font-size: 1em;
	font-family: Arial, Helvetica, sans-serif;
}
#header {
	width: 100%;
	height: auto;
	position: absolute;
	top: 0;
	border-bottom: 5px lightgrey ridge
}
#nav {
	width: 180px; /* gleich Breite iframe !!! */
	height: auto; 
	position: absolute;
	top: 85px; /* Header iframe 80px + border 4 px */
	bottom: 25px; /* Footer iframe 20px + border 4 px */
	left: 0;
	overflow: hidden;
	border-right: 5px lightgrey ridge
}
#nav iframe {
  position: absolute; 
  top: 0; 
  left: 0;
  bottom: 0; 
  width: 100%; 
  height: 100%; 
}
/* Hauptinhalt */
#main {
	/*   width: 80%; */
	position: absolute;
	top: 86px; /* Header 80px + border 4 px */
	bottom: 25px; /* Footer iframe 20px + border 4 px */
	right: 0;
	left: 185px; /* Breite links + Border links */
	overflow: auto;
}
#footer {
	width: 100%;
	height: auto;
	position: absolute;
	left: 0;
	bottom: 0;
	border-top: 5px lightgrey ridge
}
/* allgemeine Formatierungen */
/* Überschriften */
h1 {
	text-align: center;
	text-decoration: underline;
}
h2 {
	text-align: center;
}
h3 {
	text-align: center;
}
/* Tabelle mit Schriftart Festbreite für BASCOM-Code */
.Festbreite {
	font-family: Courier New, Courier, monospace;
	margin-left: 20px;
	margin-right: 20px;
}
/* Blocksatz*/
.Blocksatz {
   text-align: justify;
   margin-left: 20px;
   margin-right: 20px;
}