body{
                    /*text-align: center;*/     /*Zentrierung IE*/
                    background-color: aquamarine;
                    width: 600px;
                    margin: 0 auto;
                }
        
                #kopfzeile{
                    background-color: lightskyblue;
                    border-bottom: 2px solid black;
                    height: 20px;
                    text-align: center;
                    font-size: 20px;
                    padding: 20px;
                }
                
                #fusszeile{
                    clear: both;
                    height: 10px;
                    background-color: lightskyblue;
                    border-top: 2px solid black;
                    text-align: center;
                    font-size: 10px;
                    padding: 20px;
                }
                
                #seitenbereich{
                    /*text-align: left; */          /*Inhalt wieder links*/
                    /*margin: 0 auto;   */          /*Zentrierung mitte*/
                    background-color: silver;
                    
                }
                
                #spalte1 {
                    float:left;
                    background-color:thistle;
                    height: 1em; 
                    width:  10em;
                    padding: 10px 10px;
                }
                
                #spalte2 {
                    background-color:lightblue;
                    margin-left: 11.2em;
                    height: 1em;
                    padding: 10px 10px;
                }
 
                #spalte3 {
                    float:left;
                    background-color:thistle;
                    height: 1em; 
                    width:  15em;
                    padding: 10px 10px;
                }
                
                #spalte4 {
                    background-color:lightblue;
                    margin-left: 16.2em;
                    height: 1em;
                    padding: 10px 10px;
                }
                
                span.pflichtfeld{
                    font-size: 12px;
                    color: Red;
                }