You open a modal. For one frame, before you can even read what it says, the page behind it flinches β€” the whole column of text shifts a few pixels to the right, like the browser flinched too. Close the modal and it snaps back.

Source: [Dev.to](https://dev.to/parsajiravand/i-deleted-my-scroll-lock-librarys-ugly-hack-scrollbar-gutter-replaces-it-42bh)

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