Bedford- Sticky header change opacity or color as page is scrolled

Site URL: http://www.peakwalkerpdx.com

Hi I currently have CSS installed on my page so that when scrolled through, the header follows along stuck at the top of the browser window. I would like for the header background color to be transparent over a banner image and then increase in opacity once it is scrolled past the banner image. Can anyone share coding to do this?

This is the CSS currently installed to make the banner sticky and fix the overlap onto the main page:

1 hour ago, Peakwalker said:

Site URL: http://www.peakwalkerpdx.com

Hi I currently have CSS installed on my page so that when scrolled through, the header follows along stuck at the top of the browser window. I would like for the header background color to be transparent over a banner image and then increase in opacity once it is scrolled past the banner image. Can anyone share coding to do this?

This is the CSS currently installed to make the banner sticky and fix the overlap onto the main page:

header#header {

position: fixed !important;

left: 0;

right: 0;

top: 0;

z-index: 999;

}

main#page {

margin-top: 80px;

}

Add this into page code injection to enable a scroll-wise animation

<script src="//cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.7/ScrollMagic.min.js"></script>
<style>
#header {
  transition: all 0.5s;
}
.header-transparent{
  background-color: transparent !important;
}
</style>
<script>
  document.addEventListener('DOMContentLoaded', function() {
      var controller = new ScrollMagic.Controller();
      var myScene = new ScrollMagic.Scene().addTo(controller);
      var scene = new ScrollMagic.Scene({
              triggerElement: "#block-yui_3_17_2_1_1563832386099_11359",
              triggerHook: 0,
              duration: document.querySelector("#block-yui_3_17_2_1_1563832386099_11359").clientHeight
          })
            .setClassToggle('#header', 'header-transparent')
            .reverse(true)
            .addTo(controller);
});
</script>

the text "#block-yui_3_17_2_1_1563832386099_11359" is unique id of the block you want the the header transparent, find it using: Squarespace ID Finder - Chrome Web Store (google.com)