#3277A6

CSS

:root {
  --brilliant-blue: #3277a6;
  --brilliant-blue-rgb: 50 119 166;
  --brilliant-blue-oklch: oklch(0.547 0.101 241.8);
}

.element {
  color: var(--brilliant-blue);
  background-color: hsl(204 54% 42%);
  border-color: oklch(0.547 0.101 241.8);
}

Tailwind CSS v4

@theme {
  --color-brilliant-blue: #3277a6;
  --color-brilliant-blue-50: #def9ff;
  --color-brilliant-blue-100: #ccedff;
  --color-brilliant-blue-200: #b0dafd;
  --color-brilliant-blue-300: #8bbee8;
  --color-brilliant-blue-400: #66a6d5;
  --color-brilliant-blue-500: #408ec3;
  --color-brilliant-blue-600: #3878a4;
  --color-brilliant-blue-700: #2c6084;
  --color-brilliant-blue-800: #1d4762;
  --color-brilliant-blue-900: #133144;
  --color-brilliant-blue-950: #051d2c;
}

SCSS

$brilliant-blue: #3277a6;
$brilliant-blue-rgb: 50, 119, 166;
$brilliant-blue-light: mix(#fff, $brilliant-blue, 20%);
$brilliant-blue-dark: mix(#000, $brilliant-blue, 20%);

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