Add on for K4 Keyboard – Keychron Portugal

--color-scheme-4-bg: 238 238 238 / 1.0; --color-scheme-4-grad: ; --color-scheme-4-heading: 51 51 51; --color-scheme-4-text: 51 51 51; --color-scheme-4-btn-bg: 51 51 51; --color-scheme-4-btn-text: 255 255 255; --color-scheme-4-btn-bg-hover: 90 90 90;