How to fix background scroll issues in CSS

I'm sure you've seen this before. You have a long page and perhaps a modal with a scroll inside of it.

Super annoying if the background scrolls with when you hit bottom right?

See this example below.

As you can see, scrolling inside the modal and hitting bottom or top of the content will also scroll the background.

This is not really what we want as we are scrolling inside the modal content.

Introducing overscroll-behavior

Say hello to overscroll-behavior, the welcome addition to scroll element which tells how the over scroll behavior should be handled.

It takes one of the following properties:

auto: What it used to be, so back to normal
contain: Inside the element, your scroll is as usual, but no outside elements are affected
none: No outside elements are affected, and default scroll overflow behavior is prevented.

With every overflow, you can specify on which axis it should occur.

For horizontal scrolling, use: overscroll-behavior-x. And for vertical scroll use: overscroll-behavior-y.

Let's try it out on our demo modal by adding the following CSS to our modal element.

overscroll-behavior-y: contain;

And now try it out in this Codepen example to see what happens!

The support is becoming pretty good. Unfurtionally it's not a solid feature to rely on.

Let's hope we get full support soon, as this is a real live saver 👀.

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