Blue Ruin

CSS

:root {
  --blue-ruin: #0066dd;
  --blue-ruin-rgb: 0 102 221;
  --blue-ruin-oklch: oklch(0.535 0.199 258.1);
}

.element {
  color: var(--blue-ruin);
  background-color: hsl(212 100% 43%);
  border-color: oklch(0.535 0.199 258.1);
}

Tailwind CSS v4

@theme {
  --color-blue-ruin: #0066dd;
  --color-blue-ruin-50: #d4f7ff;
  --color-blue-ruin-100: #c1eaff;
  --color-blue-ruin-200: #a2d5ff;
  --color-blue-ruin-300: #79b6ff;
  --color-blue-ruin-400: #4c9cff;
  --color-blue-ruin-500: #167fff;
  --color-blue-ruin-600: #176cdd;
  --color-blue-ruin-700: #1356b2;
  --color-blue-ruin-800: #014085;
  --color-blue-ruin-900: #022c5e;
  --color-blue-ruin-950: #001840;
}

SCSS

$blue-ruin: #0066dd;
$blue-ruin-rgb: 0, 102, 221;
$blue-ruin-light: mix(#fff, $blue-ruin, 20%);
$blue-ruin-dark: mix(#000, $blue-ruin, 20%);

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