Into the Night

CSS

:root {
  --into-the-night: #1e3642;
  --into-the-night-rgb: 30 54 66;
  --into-the-night-oklch: oklch(0.319 0.037 231.2);
}

.element {
  color: var(--into-the-night);
  background-color: hsl(200 38% 19%);
  border-color: oklch(0.319 0.037 231.2);
}

Tailwind CSS v4

@theme {
  --color-into-the-night: #1e3642;
  --color-into-the-night-50: #ebf7fe;
  --color-into-the-night-100: #dceaf2;
  --color-into-the-night-200: #c6d7e2;
  --color-into-the-night-300: #a6bbc8;
  --color-into-the-night-400: #89a3b1;
  --color-into-the-night-500: #6e8b9a;
  --color-into-the-night-600: #5d7683;
  --color-into-the-night-700: #4a5e69;
  --color-into-the-night-800: #35454d;
  --color-into-the-night-900: #243035;
  --color-into-the-night-950: #131c20;
}

SCSS

$into-the-night: #1e3642;
$into-the-night-rgb: 30, 54, 66;
$into-the-night-light: mix(#fff, $into-the-night, 20%);
$into-the-night-dark: mix(#000, $into-the-night, 20%);

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