#buero{

  	}
  table, th, td {
  		border-width: 3px;border-color: navy;
		border-style: solid;border-collapse: collapse;
                margin-left:auto;margin-right:auto;
  	}
  th, td {
  		border-width: 1px; border-style: dotted;
  	}
  .gemeinsam{
 		color:navy;
                 }