Custom Coding Brine Family Banner Overlay Text

I need to custom code the overlay color of the banner text, but I can't for the life of me figure out how to do that. I've tried changing code in design-custom CSS, banner settings, index settings. The way Sonora is setup, I have to have my "pages" under index to show the different sections. I'm not in love with the way Sonora has all the different "sections" of a page categorizes as their own pages.

www.openrangeandco.com

Add to Page Settings > Advanced > Header

<style>
  .Parallax-item:after {
    background: rgba(0,0,0,0.5);
    content: "";
    width: 100%;
    height: 100%;
    z-index: 999;
    position: absolute;
}
</style>