issue renderding svg with withe backgound

Hello,

It seems that the rendering of svg files (for example the one is "check understanding" ) is keeping white when the page is white. Making it not visible.

It works well in "reader view" (could be quick solution)

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Reproduce the SVG rendering issue on the page described in the report, comparing the normal page with reader view. Inspect the page's CSS and SVG presentation to identify why the illustration is invisible on a white page; done means the example SVG is visible on the normal page without regressing reader view.

Written by the indexing model from the issue text.