Fix Waitlist button padding issue

[doct0r-furcation]

Join waitlist had a padding error; i've added the join waitlist form as a specification of cta-button-group in book.less; this change should make all paddings uniform.

Issue #11036

Fix

Technical

The padding for all form buttons should be uniform after merging this fix.

Testing

Refer to #11036 (comment)

Screenshot

I am not entirely sure how to check the browser/UI implementation of the issue.

Stakeholders

@RayBB @mekarpeles

[RayBB]

@doct0r-furcation were you able to run this locally (or in gitpod) to see it working? If so, can you share a screenshot?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 17.85%. Comparing base (e027195) to head (539c246).
⚠️ Report is 414 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11079      +/-   ##
==========================================
+ Coverage   17.14%   17.85%   +0.71%     
==========================================
  Files          91       92       +1     
  Lines        4981     5096     +115     
  Branches      867      887      +20     
==========================================
+ Hits          854      910      +56     
- Misses       3588     3639      +51     
- Partials      539      547       +8     

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[mekarpeles]

Before

After

[mekarpeles]

Squash on merge, if possible please :)

[jimchamp]

Thanks @doct0r-furcation! Everything is looking good on testing for all screen sizes.