#006084

CSS

:root {
  --blue-velvet: #006084;
  --blue-velvet-rgb: 0 96 132;
  --blue-velvet-oklch: oklch(0.46 0.095 232.9);
}

.element {
  color: var(--blue-velvet);
  background-color: hsl(196 100% 26%);
  border-color: oklch(0.46 0.095 232.9);
}

Tailwind CSS v4

@theme {
  --color-blue-velvet: #006084;
  --color-blue-velvet-50: #dcfaff;
  --color-blue-velvet-100: #caeeff;
  --color-blue-velvet-200: #addcf7;
  --color-blue-velvet-300: #87c0e1;
  --color-blue-velvet-400: #61a8cd;
  --color-blue-velvet-500: #3890bb;
  --color-blue-velvet-600: #317a9e;
  --color-blue-velvet-700: #27627e;
  --color-blue-velvet-800: #19485d;
  --color-blue-velvet-900: #103241;
  --color-blue-velvet-950: #031e2a;
}

SCSS

$blue-velvet: #006084;
$blue-velvet-rgb: 0, 96, 132;
$blue-velvet-light: mix(#fff, $blue-velvet, 20%);
$blue-velvet-dark: mix(#000, $blue-velvet, 20%);

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