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css-be:
----------
	.changeNav {
		background-color: #ffffff!important;
	}
-------------
jquery-be:

  //change navigation color
$(window).scroll(function() {
    if ($(document).scrollTop() > 50) {
        $('.navbar').addClass('changeNav');
        //$('.firmenname').hide();
    } else {
        $('.navbar').removeClass('changeNav');
        //$('.firmenname').show();
    }
});