Please go to the section you want to change the background color, scroll down to CUSTOM CSS and paste the code:
{
background-color: #fbb08c;
}
In the code above, a sample color with hex code fbb08c is used, which looks like the color of Macaroni And Cheese. You can replace it with your color's hex code. You can find the hex code at the website https://www.color-hex.com/