Color Palette (color-palette) free WordPress plugin

The Color Palette block displays a group of colors on your page. The block starts with 3 individual Color blocks, but you can add additional blocks or remove excess blocks as needed.

Give each color block a color using the selector in the Inspector Panel on the right-hand side of the editor, give your color a name, and you are done! If you need to use the same color palette on multiple pages or posts, simply save the Color Palette block with all of your colors as a reusable block through the editor.