#256EF8

CSS

:root {
  --blue-ribbon: #256ef8;
  --blue-ribbon-rgb: 37 110 248;
  --blue-ribbon-oklch: oklch(0.578 0.219 261.6);
}

.element {
  color: var(--blue-ribbon);
  background-color: hsl(219 94% 56%);
  border-color: oklch(0.578 0.219 261.6);
}

Tailwind CSS v4

@theme {
  --color-blue-ribbon: #256ef8;
  --color-blue-ribbon-50: #d5f6ff;
  --color-blue-ribbon-100: #c2e8ff;
  --color-blue-ribbon-200: #a4d3ff;
  --color-blue-ribbon-300: #7cb3ff;
  --color-blue-ribbon-400: #5097ff;
  --color-blue-ribbon-500: #2678ff;
  --color-blue-ribbon-600: #2267e8;
  --color-blue-ribbon-700: #1b52bb;
  --color-blue-ribbon-800: #073d8c;
  --color-blue-ribbon-900: #052a63;
  --color-blue-ribbon-950: #001644;
}

SCSS

$blue-ribbon: #256ef8;
$blue-ribbon-rgb: 37, 110, 248;
$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);
}