fix: image is not readable in dark theme #29841
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Description
Images were not readable in dark theme, so changed the background color to white.
Motivation
The png images on the website are unreadable in dark theme. So I changed their background colour to white which makes them much more readable.
Additional details
Before, it was unreadable in dark mode, screenshot for reference:

Now the image is readable.

Related issues and pull requests
Relates to #29840