V15 Bugfix: Horizontal scrollbar in Media section #19479

[Lili-Rossiter]

Fix for issue #19479

Description

Dropzone element in media section given "box-sizing: border-box" to stop horizontal scroll bar appearing unnecessarily

Before:

After:

[github-actions]

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[georgebid]

Hey @Lili-Rossiter thanks a lot for your contribution! One of the members of the core collaborators team will review this soon 😄

[bjarnef]

It seems removing width: 100% from #dropzone also fix this.

Perhaps the border-radius should also be zero, so there isn't any gap at edges.

Another issue is duplicate dropzone, at least in Edge browser it complains about this :)