How do I change the background colour of the body in blog post?

Site URL: https://biddie.co

Hi, I would like to change the colour of the body to my blog post? 

On 1/8/2021 at 12:14 AM, charben said:

Site URL: https://biddie.co

Hi, I would like to change the colour of the body to my blog post? 

You will need to find the unique id of each blog post using this plugin

Chrome Web Store - Extensions (google.com)

and replace with the text "#item-5f989faf8af82c649a2eb52e" in this snippet then add it into Design->Custom CSS

#item-5f989faf8af82c649a2eb52e .Main,
#item-5f989faf8af82c649a2eb52e .Site {
    background-color: yellow !important;
}

@charben I see header on mobile look huge (top/bottom padding). You can remove space within image.