#WetterCurrent {
 float:left;
 width:215px;
 height:570px;
 min-height:400px;
 margin:2px; 
 background-color:#444444;
}
#WetterUnit {
 float:left;
 width:60px;
 height:570px;
 min-height:400px;
 margin:2px;
 margin-right:0px;
 background-color:#444444;
}
#WetterForeCast {
 float:left;
 width:calc(100% - 283px);
 height:570px;
 min-height:400px;
 margin:2px;
 margin-left:0px;
 background-color:#444444;
}