Fix default section stiling

[alexcarol]

Partial fix for #253

It fixes the color and background in sections with calcite-mode-dark and also centers the content in default-content-wrapper

Before:

After:

Test URLs:

• Original: https://www.esri.com/fr-fr/about/about-esri/overview
• Before: https://main--esri-eds--esri.aem.live/fr-fr/about/about-esri/overview
• After: https://fix-themebackground--esri-eds--esri.aem.live/fr-fr/about/about-esri/overview

[aem-code-sync[bot]]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed. In case there are problems, just click a checkbox below to rerun the respective action.

• [ ] Re-run PSI checks
• [ ] Re-sync branch

Commits

* [95555cf](https://github.com/Esri/esri-eds/commit/95555cf6f13b0746bfa5abd7e43492777a79015d) :white_check_mark: (latest) * [0572678](https://github.com/Esri/esri-eds/commit/0572678ab553884f713753442df40d19e496d779) :white_check_mark:

[aem-code-sync[bot]]

	Page	Scores	Audits	Google
:iphone:	/fr-fr/about/about-esri/overview
:desktop_computer:	/fr-fr/about/about-esri/overview