How would I adjust Header transition timing?

I'm currently using a scrolling header option that transitions from transparent to a solid color when you begin scrolling (on version 7.1). How can I adjust the header transition timing so that the solid color doesn't arrive until the user hits the second section, if you will? 

For example, please see the pair of screenshots. The transparent header transitions to a black solid background almost immediately; I'd like it to transition to a black solid background at the transition between the hero and the Contact Us section. 

Can you share site url? We can check easier

www.teamdb.solutions is the URL

Try this code to Website > Website Tools > Code Injection > Footer

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
<script>
$(function(){
 var visibleTop = 800;
  $(window).scroll(function() {
    var scroll = getCurrentScroll();
      if ( scroll >= visibleTop ) {
           $('header#header').addClass('test-something');
        }
        else {
            $('header#header').removeClass('test-something');
        }
  });
function getCurrentScroll() {
    return window.pageYOffset || document.documentElement.scrollTop;
    }
});
</script>
<style>
  header#header {
    background-color: transparent !important;
}
header#header.test-something {
    background-color: #000 !important;
}
</style>