#0F6AFD

CSS

:root {
  --blue-ribbon: #0f6afd;
  --blue-ribbon-rgb: 15 106 253;
  --blue-ribbon-oklch: oklch(0.571 0.233 260.8);
}

.element {
  color: var(--blue-ribbon);
  background-color: hsl(217 98% 53%);
  border-color: oklch(0.571 0.233 260.8);
}

Tailwind CSS v4

@theme {
  --color-blue-ribbon: #0f6afd;
  --color-blue-ribbon-50: #d2f6ff;
  --color-blue-ribbon-100: #bfe8ff;
  --color-blue-ribbon-200: #9fd3ff;
  --color-blue-ribbon-300: #76b3ff;
  --color-blue-ribbon-400: #4697ff;
  --color-blue-ribbon-500: #0e77ff;
  --color-blue-ribbon-600: #1165ef;
  --color-blue-ribbon-700: #0e51c1;
  --color-blue-ribbon-800: #003c90;
  --color-blue-ribbon-900: #002966;
  --color-blue-ribbon-950: #001647;
}

SCSS

$blue-ribbon: #0f6afd;
$blue-ribbon-rgb: 15, 106, 253;
$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);
}