/*Hauptfenster*/
	.div_mainaerea {
	background-color: #D4D0C8;
	text-align: center;
	padding: 10px;
	margin: 0 auto;
	min-height: 700px;
	border: 1px solid #C0C0C0;
	}
	.iframe_btool {
	min-height: 800px;
	width: 100%;
	border: 0px solid red;
	}	
	.iframe_personally {
	min-height: 800px;
	width: 100%;
	border: 0px solid red;
	}	
@media only screen and (max-width: 600px) { /* Extra small devices (phones, 600px and down) */

} /*Ende von @media only screen and (max-width: 600px)*/

@media only screen and (min-width: 600px) { /* Small devices (portrait tablets and large phones, 600px and up) */

} /*Ende von @media only screen and (min-width: 600px)*/

@media only screen and (min-width: 768px) { /* Medium devices (landscape tablets, 768px and up) */

} /*Ende von @media only screen and (min-width: 768px)*/

@media only screen and (min-width: 992px) { /* Large devices (laptops/desktops, 992px and up) */

} /*Ende von @media only screen and (min-width: 992px)*/

@media only screen and (min-width: 1200px) { /* Extra large devices (large laptops and desktops, 1200px and up) */

} /*Ende von @media only screen and (min-width: 1200px)*/