BUG: When the side bar is collapsed for full view; the apply to join this space button does not stretch across the whole section

[Comoque1]

Describe the bug A clear and concise description of what the bug is.

To Reproduce Steps to reproduce the behavior:

1. Go to https://dev-alkem.io/space-march-20/challenges/secondchallenge-3260 with space member
2. Collapse the left view - Join this space button does not stretch across

Expected behavior When the side bar is collapsed for full view; the apply to join this space button does stretches across the whole section.