Mobile in-app browser navigation glitching

Opened up an article inside the Reddit in-app browser and noticed some funky glitching in the navigation.

Issue
On open, the nav starts half-scrolled, and then on scroll you can see the bottom of the text going behind the navigation.

On mobile Chrome, Safari, and Firefox, the same thing happens- where if the user scrolls inside the nav, the content behind it scrolls- you just can't see it in these browsers due to correct screen positioning of the nav. The in-app browser seems to force the nav to have some kind of margin at the bottom.

This definitely could also be a gatsby problem, reddit mobile problem, in-app browsers as a whole problem, or this particular site problem. I also never throw out the possibility of it being a problem with my own device. I'll poke around and see what I can find.

Sidenote: I also have a CSS hack fix that prevents background content from scrolling when the user scrolls in the nav. I'll open a new issue for that if that's wanted.

まず、Redditのアプリ内ブラウザーでのナビゲーションの動作を再現し、モバイル版のChrome、Safari、Firefoxと比較します。サイトのナビゲーションとCSSを調査し、その後、ナビゲーションが一貫して配置されていること、またナビゲーション内をスクロールしても背後のコンテンツが表示されたり移動したりしないことを確認します。