#467F8A

CSS

:root {
  --mysterious-blue: #467f8a;
  --mysterious-blue-rgb: 70 127 138;
  --mysterious-blue-oklch: oklch(0.562 0.062 211.5);
}

.element {
  color: var(--mysterious-blue);
  background-color: hsl(190 33% 41%);
  border-color: oklch(0.562 0.062 211.5);
}

Tailwind CSS v4

@theme {
  --color-mysterious-blue: #467f8a;
  --color-mysterious-blue-50: #e2faff;
  --color-mysterious-blue-100: #d1eef4;
  --color-mysterious-blue-200: #b7dce4;
  --color-mysterious-blue-300: #93c0cb;
  --color-mysterious-blue-400: #72a9b4;
  --color-mysterious-blue-500: #51919e;
  --color-mysterious-blue-600: #467b85;
  --color-mysterious-blue-700: #37626b;
  --color-mysterious-blue-800: #27484e;
  --color-mysterious-blue-900: #1a3236;
  --color-mysterious-blue-950: #0a1e21;
}

SCSS

$mysterious-blue: #467f8a;
$mysterious-blue-rgb: 70, 127, 138;
$mysterious-blue-light: mix(#fff, $mysterious-blue, 20%);
$mysterious-blue-dark: mix(#000, $mysterious-blue, 20%);

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