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Transparent background when top of screen only

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Mar 15.2022

I have a header bar, when my page loads of the page is scrolled to the top I want the background to be transparent so you can see the background hero image cleanly.

As the user scrolls down I want the header bar to apply my background color.

Is there a way you can do this in CSS or does it need JS ?

Either way any help on how I could do this.

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@SempervivumMar 15.2022 — No, in CSS you cannot reference the scroll position, you will need javascript.

Add an event listener for the scroll event, use rgba for the background color and change the `a` value according to the scroll position.
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