Evening Blue

CSS

:root {
  --evening-blue: #2b2b41;
  --evening-blue-rgb: 43 43 65;
  --evening-blue-oklch: oklch(0.299 0.04 283.8);
}

.element {
  color: var(--evening-blue);
  background-color: hsl(240 20% 21%);
  border-color: oklch(0.299 0.04 283.8);
}

Tailwind CSS v4

@theme {
  --color-evening-blue: #2b2b41;
  --color-evening-blue-50: #f4f4ff;
  --color-evening-blue-100: #e6e6f5;
  --color-evening-blue-200: #d2d2e5;
  --color-evening-blue-300: #b5b5cb;
  --color-evening-blue-400: #9b9cb6;
  --color-evening-blue-500: #8283a0;
  --color-evening-blue-600: #6e6f87;
  --color-evening-blue-700: #58596c;
  --color-evening-blue-800: #404150;
  --color-evening-blue-900: #2c2d38;
  --color-evening-blue-950: #191a22;
}

SCSS

$evening-blue: #2b2b41;
$evening-blue-rgb: 43, 43, 65;
$evening-blue-light: mix(#fff, $evening-blue, 20%);
$evening-blue-dark: mix(#000, $evening-blue, 20%);

.element {
  color: $evening-blue;
  box-shadow: 0 0 0 2px rgba($evening-blue, 0.35);
}