page background

Hi,
I am looking for the style code to alter the listing page background to white. To specify- it’s the background to the whole page i.e. the background to the content and the background to the field box. I do not want the background to any other pages altered as they are grey with just the content boxes white. (The design page does not alter the listing page background colour)
Have a look at this page from my directory and you can see that the background to the writing is grey and it needs to be white https://www.localgardeners.org/listing/precinct/