#005E82

CSS

:root {
  --blue-velvet: #005e82;
  --blue-velvet-rgb: 0 94 130;
  --blue-velvet-oklch: oklch(0.454 0.094 233.4);
}

.element {
  color: var(--blue-velvet);
  background-color: hsl(197 100% 25%);
  border-color: oklch(0.454 0.094 233.4);
}

Tailwind CSS v4

@theme {
  --color-blue-velvet: #005e82;
  --color-blue-velvet-50: #dcfaff;
  --color-blue-velvet-100: #cbeeff;
  --color-blue-velvet-200: #aedbf7;
  --color-blue-velvet-300: #88c0e1;
  --color-blue-velvet-400: #62a8cd;
  --color-blue-velvet-500: #3a90bb;
  --color-blue-velvet-600: #337a9d;
  --color-blue-velvet-700: #28627e;
  --color-blue-velvet-800: #1a485d;
  --color-blue-velvet-900: #113241;
  --color-blue-velvet-950: #031e2a;
}

SCSS

$blue-velvet: #005e82;
$blue-velvet-rgb: 0, 94, 130;
$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);
}