adds a white background to drag and drop in the manage selected resou…

[AllanOXDi]

Summary

Adds white background to the drag and drop in the manage selected resources.

References

#13127

[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.18.0a3.dev0_git.89.g7ef50427.pex
Windows Installer (EXE)	kolibri-0.18.0a3.dev0+git.89.g7ef50427-windows-setup-unsigned.exe
Debian Package	kolibri_0.18.0a3.dev0+git.89.g7ef50427-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.18.0a3.dev0+git.89.g7ef50427.dmg
Android Package (APK)	kolibri-0.18.0a3.dev0+git.89.g7ef50427-0.1.4-debug.apk
Raspberry Pi Image	kolibri-pi-image-0.18.0a3.dev0+git.89.g7ef50427.zip
TAR file	kolibri-0.18.0a3.dev0+git.89.g7ef50427.tar.gz
WHL file	kolibri-0.18.0a3.dev0+git.89.g7ef50427-py2.py3-none-any.whl

[AlexVelezLl]

Thanks @AllanOXDi! This looks like the right change! Although now that we have this, I am noticing that we dont have enough padding-top in the rows and is looking a bit tight while dragging the row:

I know this is not in the issue description, but can we make a little adjustment in the scope of this PR? And remove this marging-top on not of first type. And instead add a padding-top: 16px to the .resource-row class? (to all items, without excluding the first of type)

I think that will make the row look more spaced out while dragging the row.

[AllanOXDi]

Fixed

[AlexVelezLl]

Looks good to me! Thanks @AllanOXDi!