Improve styles

[Redande]

• set xxl to 7680 to scale components up to 4k monitors
• add titles to courses filters
• set background to cta links in modules
• don't overflow hero image

[codecov[bot]]

Codecov Report

Merging #1241 (a42df7a) into master (bd8a32e) will decrease coverage by 8.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1241      +/-   ##
==========================================
- Coverage   66.41%   58.41%   -8.01%     
==========================================
  Files         144      142       -2     
  Lines        6036     5963      -73     
  Branches     1433     1419      -14     
==========================================
- Hits         4009     3483     -526     
- Misses       1888     2299     +411     
- Partials      139      181      +42     

Flag	Coverage Δ
backend	58.41% <ø> (-8.01%)	:arrow_down:

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see 19 files with indirect coverage changes

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