Gulf Blue

CSS

:root {
  --gulf-blue: #343f5c;
  --gulf-blue-rgb: 52 63 92;
  --gulf-blue-oklch: oklch(0.371 0.052 267.9);
}

.element {
  color: var(--gulf-blue);
  background-color: hsl(224 28% 28%);
  border-color: oklch(0.371 0.052 267.9);
}

Tailwind CSS v4

@theme {
  --color-gulf-blue: #343f5c;
  --color-gulf-blue-50: #eff5ff;
  --color-gulf-blue-100: #e1e8fa;
  --color-gulf-blue-200: #cbd4eb;
  --color-gulf-blue-300: #adb7d3;
  --color-gulf-blue-400: #919ebe;
  --color-gulf-blue-500: #7785aa;
  --color-gulf-blue-600: #65718f;
  --color-gulf-blue-700: #515a73;
  --color-gulf-blue-800: #3a4255;
  --color-gulf-blue-900: #282e3b;
  --color-gulf-blue-950: #161a25;
}

SCSS

$gulf-blue: #343f5c;
$gulf-blue-rgb: 52, 63, 92;
$gulf-blue-light: mix(#fff, $gulf-blue, 20%);
$gulf-blue-dark: mix(#000, $gulf-blue, 20%);

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