[#12269] Instructor edit sessions page: Fix add question button overflow.

[singhabhyudita]

Fixes #12269

Outline of Solution

For screen width less than 411px, I increased the top margin of the buttons.

Here are the changes:

Instructor edit sessions page:

Instructor help page:

[domlimm]

@singhabhyudita Good attempt! Do consider what was suggested in the opening of the issue that you're currently fixing. As TEAMMATES uses a UI library, Boostrap, it is always a good rule of thumb to make use of it. Do look at the documentation for anything that you can make use of to solve the issue instead of creating custom styles that could clutter up the related files in the long run 👍🏻

Also, please ensure that all tests are passing. E2E Tests fails from time to time, not to worry, we'll look at it and re-run if it fails.

[singhabhyudita]

@domlimm alright so I should try to use the Bootstrap classes to decrease the padding between buttons as suggested in the opening of the issue?