GitBucket migration icon not visible on arc-green theme

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Gitea Version

1.16.0+dev-502-gcd32b8481

Operating System

Linux

Browser Version

Firefox 94.0

Can you reproduce the bug on the Gitea demo site?

Yes

Description

The icon is present (I checked the source code the browser received), but for some reason is made invisible in the arc green theme. When reloading the page or forcing a color update through an external dark reader, you can see it for a split second before the "correct" CSS is applied again.

Additionally, I noticed another minor display bug inside the GitBucket migration screen:

This extra text area is apparently seen as the password field by the browser as it was prefilled with my password. But what is the textarea below then?

Screenshots

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The funny thing is: Now that my night mode is not active anymore, I can even see the icon a little bit...
oops.
I couldn't see it at all because of that.

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Fixed by #17644 and #17645.