Pick a base color, generate the harmonious palette, and copy the CSS custom properties for your stylesheet.
A base color seeds a set of harmonious colors using color-theory rules, then each is emitted as a CSS variable.
A block of CSS custom properties like --color-primary and --color-accent that you paste under :root.
This tool focuses on exporting a coordinated palette as ready-to-use CSS variables rather than just showing swatches.