Deep Twilight Blue

CSS

:root {
  --deep-twilight-blue: #375f71;
  --deep-twilight-blue-rgb: 55 95 113;
  --deep-twilight-blue-oklch: oklch(0.464 0.054 228.6);
}

.element {
  color: var(--deep-twilight-blue);
  background-color: hsl(199 35% 33%);
  border-color: oklch(0.464 0.054 228.6);
}

Tailwind CSS v4

@theme {
  --color-deep-twilight-blue: #375f71;
  --color-deep-twilight-blue-50: #e6f8ff;
  --color-deep-twilight-blue-100: #d7ecf7;
  --color-deep-twilight-blue-200: #bed9e7;
  --color-deep-twilight-blue-300: #9cbdce;
  --color-deep-twilight-blue-400: #7ea5b8;
  --color-deep-twilight-blue-500: #608da3;
  --color-deep-twilight-blue-600: #517889;
  --color-deep-twilight-blue-700: #41606e;
  --color-deep-twilight-blue-800: #2e4651;
  --color-deep-twilight-blue-900: #1f3138;
  --color-deep-twilight-blue-950: #0f1d23;
}

SCSS

$deep-twilight-blue: #375f71;
$deep-twilight-blue-rgb: 55, 95, 113;
$deep-twilight-blue-light: mix(#fff, $deep-twilight-blue, 20%);
$deep-twilight-blue-dark: mix(#000, $deep-twilight-blue, 20%);

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