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Unreadable on mobile.

Quite readable on Firefox preview, if you're open to giving that a shot.

Reads fine on iOS: Safari, Firefox Focus and Chrome. What browser and OS are you using?

iOS Safari has an ever-present portrait covering half the viewport as I scroll

On iOS I use MiniHack.app which opens all links in reader-mode on the safari webview... it's quite nice, and gets right to the actual substance.

Or, perhaps you can just double-click on the text, it'll zoom on the text only.

This is what I meant.