To change background color of single text section in a blog Squarespace, you can follow these.
#1. First, you use this tool to find ID of Single Text.
In my example, we will have: #block-307c39326494411ffcb6
#2. Next, use this code to Custom CSS box
#block-307c39326494411ffcb6 {
background-color: #f1f;
}
#3. Result
