Night Train

CSS

:root {
  --night-train: #4b7689;
  --night-train-rgb: 75 118 137;
  --night-train-oklch: oklch(0.542 0.056 227.7);
}

.element {
  color: var(--night-train);
  background-color: hsl(198 29% 42%);
  border-color: oklch(0.542 0.056 227.7);
}

Tailwind CSS v4

@theme {
  --color-night-train: #4b7689;
  --color-night-train-50: #e6f9ff;
  --color-night-train-100: #d6ecf7;
  --color-night-train-200: #bdd9e8;
  --color-night-train-300: #9bbdcf;
  --color-night-train-400: #7ca6b9;
  --color-night-train-500: #5d8ea4;
  --color-night-train-600: #4f788a;
  --color-night-train-700: #3f606f;
  --color-night-train-800: #2d4751;
  --color-night-train-900: #1e3139;
  --color-night-train-950: #0e1d23;
}

SCSS

$night-train: #4b7689;
$night-train-rgb: 75, 118, 137;
$night-train-light: mix(#fff, $night-train, 20%);
$night-train-dark: mix(#000, $night-train, 20%);

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