Most blocks can be customized in the Block Settings > Appearance.
You can choose from white, back, and gray background colors. Click Save and Publish to make changes live.
You can also easily change the block background to fill it with a specific color other than those provided in the Block Settings.
Changing the background color
To set a plain color as a block background, follow these steps:
1. Use an image editor to create a rectangle shape filled with the color of your choice. Alternatively, search online for "color swatches" and take a partial screenshot of the color you like.
2. Upload this piece of the color image as a block background using the steps outlined in this tutorial: Changing the block background. Result:
Other helpful articles
Adding block background overlays