#1C69FE

CSS

:root {
  --blue-ribbon: #1c69fe;
  --blue-ribbon-rgb: 28 105 254;
  --blue-ribbon-oklch: oklch(0.571 0.233 261.9);
}

.element {
  color: var(--blue-ribbon);
  background-color: hsl(220 99% 55%);
  border-color: oklch(0.571 0.233 261.9);
}

Tailwind CSS v4

@theme {
  --color-blue-ribbon: #1c69fe;
  --color-blue-ribbon-50: #d3f5ff;
  --color-blue-ribbon-100: #c0e7ff;
  --color-blue-ribbon-200: #a1d2ff;
  --color-blue-ribbon-300: #79b2ff;
  --color-blue-ribbon-400: #4b95ff;
  --color-blue-ribbon-500: #1e75ff;
  --color-blue-ribbon-600: #1c64f0;
  --color-blue-ribbon-700: #1650c1;
  --color-blue-ribbon-800: #023b91;
  --color-blue-ribbon-900: #022967;
  --color-blue-ribbon-950: #001547;
}

SCSS

$blue-ribbon: #1c69fe;
$blue-ribbon-rgb: 28, 105, 254;
$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);
}