#126CF6

CSS

:root {
  --blue-ribbon: #126cf6;
  --blue-ribbon-rgb: 18 108 246;
  --blue-ribbon-oklch: oklch(0.569 0.221 260.1);
}

.element {
  color: var(--blue-ribbon);
  background-color: hsl(216 93% 52%);
  border-color: oklch(0.569 0.221 260.1);
}

Tailwind CSS v4

@theme {
  --color-blue-ribbon: #126cf6;
  --color-blue-ribbon-50: #d3f6ff;
  --color-blue-ribbon-100: #c0e8ff;
  --color-blue-ribbon-200: #a0d3ff;
  --color-blue-ribbon-300: #77b4ff;
  --color-blue-ribbon-400: #4898ff;
  --color-blue-ribbon-500: #1379ff;
  --color-blue-ribbon-600: #1467e9;
  --color-blue-ribbon-700: #1153bc;
  --color-blue-ribbon-800: #003d8d;
  --color-blue-ribbon-900: #012a64;
  --color-blue-ribbon-950: #001745;
}

SCSS

$blue-ribbon: #126cf6;
$blue-ribbon-rgb: 18, 108, 246;
$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);
}