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function setHeight() {
	   var windowHeight = $(window).height(),
	       $block = $('.section-main');
	    if(windowHeight < 650) {
	         $block.css({'height': windowHeight + 'px'})
	    } else {
	       $block.css({'height': ''})
	    }
	}

	setHeight();
	$(window).on('resize orientationchange', setHeight);