Update home page styles

[imamatory]

closes #599

[codecov-io]

Codecov Report

Merging #604 into master will increase coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #604      +/-   ##
==========================================
+ Coverage   79.25%   79.38%   +0.13%     
==========================================
  Files          75       75              
  Lines        1523     1523              
==========================================
+ Hits         1207     1209       +2     
+ Misses        316      314       -2

Impacted Files	Coverage Δ
services/app/lib/codebattle/tournament/server.ex	31.25% <0%> (+6.25%)	⬆️
...es/app/lib/codebattle_web/support/notifications.ex	80% <0%> (+10%)	⬆️

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