style: Fix extra spacing at bottom of issue page

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What does this MR do and why?

Fix extra spacing at bottom of issue page

When a user creates an issue containing multiple images with text, a "read more" button appears. After scrolling to the bottom, large empty spaces appear at the bottom of the page.

References

#554526 (closed)

Screenshots or screen recordings

How to set up and validate locally

You can see it by clicking this link

1. Turn "Truncate descriptions" on
2. Read more button appears when adding titles to multiple images in issue
3. scroll page to the bottom

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