Abyssal Blue

CSS

:root {
  --abyssal-blue: #00035b;
  --abyssal-blue-rgb: 0 3 91;
  --abyssal-blue-oklch: oklch(0.217 0.145 264.2);
}

.element {
  color: var(--abyssal-blue);
  background-color: hsl(238 100% 18%);
  border-color: oklch(0.217 0.145 264.2);
}

Tailwind CSS v4

@theme {
  --color-abyssal-blue: #00035b;
  --color-abyssal-blue-50: #e2f5ff;
  --color-abyssal-blue-100: #d1e8ff;
  --color-abyssal-blue-200: #b7d3ff;
  --color-abyssal-blue-300: #95b5ff;
  --color-abyssal-blue-400: #739cf4;
  --color-abyssal-blue-500: #5481e5;
  --color-abyssal-blue-600: #486dc1;
  --color-abyssal-blue-700: #39579b;
  --color-abyssal-blue-800: #264074;
  --color-abyssal-blue-900: #192c52;
  --color-abyssal-blue-950: #0a1937;
}

SCSS

$abyssal-blue: #00035b;
$abyssal-blue-rgb: 0, 3, 91;
$abyssal-blue-light: mix(#fff, $abyssal-blue, 20%);
$abyssal-blue-dark: mix(#000, $abyssal-blue, 20%);

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