Background pattern on full landing tab

[TheIsotopes]

This PR will show the background pattern on full landing tab and not only on the content_top

before this PR:

after this PR (looks much better):

[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions]

Do you want to test this code? Here you have an automated build:
Betaflight-Configurator-Android
Betaflight-Configurator-Linux
Betaflight-Configurator-macOS
Betaflight-Configurator-Windows
WARNING: It may be unstable and result in corrupted configurations or data loss. Use only for testing!

[blckmn]

AUTOMERGE: (FAIL)

• github identifies PR as mergeable -> PASS
• assigned to a milestone -> PASS
• cooling off period lapsed -> FAIL
• commit count less or equal to three -> PASS
• Don't merge label NOT found -> PASS
• at least one RN: label found -> PASS
• Tested label found -> FAIL
• assigned to an approver -> FAIL
• approver count at least three -> FAIL

[KarateBrot]

Unfortunately the css styling of the background doesn't work in dark mode anymore. Can you see what's up? Probably the corresponding CSS needs to be changed slightly.

[TheIsotopes]

@KarateBrot should fixed in #3734