Change background banner Colour to white in Preview Job Offer page

Summary:

While Previewing the Job Offer, it's not displaying the background in white colour

Content (required):

Whenever a Recruiter previews a job offer, it's displaying the background in different Colour instead of White background.

And the body of the content is showing as white. for this to appear i am using the custom CSS as,

"

.offer-details-letter{

background:white;

}

"

But to display background in White, i am not getting any Custom CSS to apply in Career site.

Anyone know, what is the custom CSS i need to use to display background in White for Preview Job offer page.

But when we are in 23A, we didn't used any custom CSS in Career site. Even though it displayed preview offer page in White as shown in Image 1 attached.