#005EFB

CSS

:root {
  --blue-ribbon: #005efb;
  --blue-ribbon-rgb: 0 94 251;
  --blue-ribbon-oklch: oklch(0.545 0.245 261.6);
}

.element {
  color: var(--blue-ribbon);
  background-color: hsl(218 100% 49%);
  border-color: oklch(0.545 0.245 261.6);
}

Tailwind CSS v4

@theme {
  --color-blue-ribbon: #005efb;
  --color-blue-ribbon-50: #d1f5ff;
  --color-blue-ribbon-100: #bee7ff;
  --color-blue-ribbon-200: #9dd2ff;
  --color-blue-ribbon-300: #74b1ff;
  --color-blue-ribbon-400: #4494ff;
  --color-blue-ribbon-500: #0e73ff;
  --color-blue-ribbon-600: #1062f6;
  --color-blue-ribbon-700: #0d4fc6;
  --color-blue-ribbon-800: #003a95;
  --color-blue-ribbon-900: #002869;
  --color-blue-ribbon-950: #001549;
}

SCSS

$blue-ribbon: #005efb;
$blue-ribbon-rgb: 0, 94, 251;
$blue-ribbon-light: mix(#fff, $blue-ribbon, 20%);
$blue-ribbon-dark: mix(#000, $blue-ribbon, 20%);

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