Plugin and Theme upload form input button alignment

[seedsca]

When installing new plugin/theme from file, the file upload form has it's input button misaligned. Seems it should be aligned with the install now button.

Verified with multiple browsers.

[seedsca]

Looks like editing /wp-admin/css/themes.css to add justify-content: space-between; and removing some padding did the trick.

[piyushmca]

Please Check

[seedsca]

Good point @piyushmca, both Chrome and Safari seem to add some padding to their buttons on the bottom. I see no way to make this work universally. But my patch gets most of the browsers nearly there.Since if you look, the only browser currently having it's button aligned is Safari. All of the rest are off.

[SergeyBiryukov]

In 47599:

Upload: Better align file input and buttons in plugin/theme upload form.

Follow-up to [47271].

Props seedsca, piyushmca.
Fixes #49914.

[afercia]

In 47750:

Upload: Improve file input and button alignment in plugin/theme upload form.

Resets flexbox on smaller screens. Improves vertical alignment on large screens.
Follow-up to [47599] and [47271].

Props mukesh27, DarkoG.
See #48859, #49914.
Fixes #49951.