Controlling 'Background Subdued' Checkout Colour

[pearlerwork]

URL: https://bit.ly/3QRgif9

Theme: Dawn

Two client websites are having the same issue where the background of their transparent product image and the buttons on the cart page are turning to a random, bright yellow?

This variable seems to be the cause: 

background-color: var(--x-default-color-background-subdued);

Here's my code I'm trying to add to change it (added to base.css)

:root {
  --x-default-color-background-subdued): #fff;
}

 Thanks for you help.

[websensepro]

Hi, @pearlerwork.

please send a screenshot of which page issue.

[pearlerwork]

It's just the cart page. See attached: