docs: add demo style

[danranVm]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added/updated or not needed
• Docs and demo have been added/updated or not needed

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Component style update
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Application (the showcase website) / infrastructure changes
• Other... Please describe:

What is the current behavior?

What is the new behavior?

Other information

[codecov]

Codecov Report

Merging #181 (36deadd) into main (0aa2559) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #181   +/-   ##
=======================================
  Coverage   95.82%   95.82%           
=======================================
  Files          74       74           
  Lines        1556     1556           
  Branches      265      265           
=======================================
  Hits         1491     1491           
  Misses         34       34           
  Partials       31       31           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0aa2559...2bc4b7d. Read the comment docs.