@media only screen and (min-width: 1200px) {
    body {color: red;}
	#telefon { margin-left: 33%; margin-right: 33%; }
}

@media only screen and (min-width: 980px) and (max-width: 1199px) {
    body {color: red;}
	#telefon { margin-left: 33%; margin-right: 33%; }
}

@media only screen and (min-width: 768px) and (max-width: 979px) {
	body {color: green;}
	#telefon { margin-left: 33%; margin-right: 33%; }
}