Hide Logo when scrolling down

hm – when reading his topic i guess he will only hide the logo when scrolling – so maybe this in child-theme functions.php
will do the job ( but without seeing your site it is hard to give advice)

function hide_logo_on_scrolling(){
?>
<script>
(function($) {
	$(function() {
		    $( window ).scroll(function() {
		    	$('.logo img').css({ 
		    	        'opacity': '0',
				'transition': 'all 1s ease',
		    	});
    			clearTimeout( $.data( this, "scrollCheck" ) );
    			$.data( this, "scrollCheck", setTimeout(function() {
    				$('.logo img').css({
    				'opacity': '1',
    				'transition': 'all 1s ease',
    				});
    			}, 250) );
    		});
	});
})( jQuery );
</script>
<?php
}
add_action('wp_footer', 'hide_logo_on_scrolling');