Module caché, le menu déroulant apparaît

Revealing JS

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>

//You can replace offset value from here
var offset = 300

$(window).on('load scroll', function(){
    
    if( $(window).scrollTop() > offset ){
        $('body').addClass('show')
    }else{
        $('body').removeClass('show')
    }
})

</script>

Revealing CSS

selector{
    opacity: 0;
    transition: all 0.3s ease-in-out;
}
body.show selector{
    opacity: 1;
}