chore: css fixes

[ShantiCumulio]

Css fixes for drag-n-drop showcase

[github-actions]

Test Summary - Run #63

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Pending ⏳	Other ❓	Flaky 🍂	Duration ⏱️
4	2	2	0	0	0	0	00:01:51

❌ Some tests failed!

Name	Status	Failure Message
should have working initial screen	failed ❌	Error: �[31mScreenshot comparison failed:�[39m

Expected an image 1920px by 1080px, received 1920px by 1207px. 245387 pixels (ratio 0.11 of all image pixels) are different.

Expected: �[33m/home/runner/work/flex-showcases/flex-showcases/e2e/tests/drag-n-drop-chart-library/drag-n-drop-chart-library.spec.ts-snapshots/init-page-chromium-linux.png�[39m
Received: �[33m/home/runner/work/flex-showcases/flex-showcases/e2e/test-results/drag-n-drop-chart-library--769ed-have-working-initial-screen-chromium-retry2/init-page-actual.png�[39m
Diff: �[33m/home/runner/work/flex-showcases/flex-showcases/e2e/test-results/drag-n-drop-chart-library--769ed-have-working-initial-screen-chromium-retry2/init-page-diff.png�[39m

Call log:
�[2m- expect.toHaveScreenshot(init-page.png) with timeout 5000ms�[22m
�[2m - verifying given screenshot expectation�[22m
�[2m - taking page screenshot�[22m
�[2m - disabled all CSS animations�[22m
�[2m - waiting for fonts to load...�[22m
�[2m - fonts loaded�[22m
�[2m - Expected an image 1920px by 1080px, received 1920px by 1207px. 244539 pixels (ratio 0.11 of all image pixels) are different.�[22m
�[2m - waiting 100ms before taking screenshot�[22m
�[2m - taking page screenshot�[22m
�[2m - disabled all CSS animations�[22m
�[2m - waiting for fonts to load...�[22m
�[2m - fonts loaded�[22m
�[2m - captured a stable screenshot�[22m
�[2m - Expected an image 1920px by 1080px, received 1920px by 1207px. 245387 pixels (ratio 0.11 of all image pixels) are different.�[22m
|
| should have working initial screen | failed ❌ | No failure message |

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