Change font colour on details page.

I have a theme that has a black background white content block and black text.
all pages work fine apart from the car details page.

The white content block doesn’t show so the page show a black background with black text so you can’t see the text.
How can I either show the block or make the text white.

https://martinbrothersmotorcompany.co.uk/showroom1/

Thanks Jimi