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