Mobile app visual - change blog background color to primary background
Summary
(Summarize the bug encountered concisely)
Currently, the blog background color is grey, and is a bit harsh on the eyes in the mobile context. Let's change it so that the background blends in well with the rest of the app in dark mode, by changing background color to grey-900 or 'primary-dark-bg'
Steps to reproduce
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Platform information
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What is the current bug behavior?
(What actually happens)
What is the expected correct behavior?
(What you should see instead)
Relevant logs and/or screenshots
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Possible fixes
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