Fix css warning in angular-cli example

[igor-dv]

Issue: #2735 (comment)

What I did

Moved the css-rules-warning class to style.css

[Quramy]

@igor-dv 👍

[codecov]

Codecov Report

Merging #2789 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2789   +/-   ##
=======================================
  Coverage   35.83%   35.83%           
=======================================
  Files         427      427           
  Lines        9422     9422           
  Branches      953      957    +4     
=======================================
  Hits         3376     3376           
+ Misses       5434     5410   -24     
- Partials      612      636   +24

Impacted Files	Coverage Δ
app/react/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/react/src/server/babel_config.js	0% <0%> (-76.67%)	⬇️
app/polymer/src/server/utils.js	0% <0%> (-53.58%)	⬇️
addons/graphql/src/components/FullScreen/index.js	0% <0%> (ø)	⬆️
addons/storyshots/src/vue/renderTree.js	60% <0%> (ø)	⬆️
app/angular/src/server/ts_config.js	38.09% <0%> (ø)	⬆️
addons/a11y/src/components/Report/RerunButton.js	0% <0%> (ø)	⬆️
lib/ui/src/libs/withLifecycleDecorator.js	17.14% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/layout/dimensions.js	15.62% <0%> (ø)	⬆️
addons/a11y/src/components/Report/index.js	0% <0%> (ø)	⬆️
... and 50 more

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