Blue Oblivion

CSS

:root {
  --blue-oblivion: #26428b;
  --blue-oblivion-rgb: 38 66 139;
  --blue-oblivion-oklch: oklch(0.401 0.126 265.3);
}

.element {
  color: var(--blue-oblivion);
  background-color: hsl(223 57% 35%);
  border-color: oklch(0.401 0.126 265.3);
}

Tailwind CSS v4

@theme {
  --color-blue-oblivion: #26428b;
  --color-blue-oblivion-50: #e5f5ff;
  --color-blue-oblivion-100: #d5e7ff;
  --color-blue-oblivion-200: #bcd3ff;
  --color-blue-oblivion-300: #9bb6f9;
  --color-blue-oblivion-400: #7a9ce9;
  --color-blue-oblivion-500: #5d82d9;
  --color-blue-oblivion-600: #4f6eb7;
  --color-blue-oblivion-700: #3f5893;
  --color-blue-oblivion-800: #2b416e;
  --color-blue-oblivion-900: #1d2d4d;
  --color-blue-oblivion-950: #0d1933;
}

SCSS

$blue-oblivion: #26428b;
$blue-oblivion-rgb: 38, 66, 139;
$blue-oblivion-light: mix(#fff, $blue-oblivion, 20%);
$blue-oblivion-dark: mix(#000, $blue-oblivion, 20%);

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