#507A91

CSS

:root {
  --cry-me-a-river: #507a91;
  --cry-me-a-river-rgb: 80 122 145;
  --cry-me-a-river-oklch: oklch(0.558 0.059 233.2);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(201 29% 44%);
  border-color: oklch(0.558 0.059 233.2);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #507a91;
  --color-cry-me-a-river-50: #e6f8ff;
  --color-cry-me-a-river-100: #d6ecf9;
  --color-cry-me-a-river-200: #bdd9ea;
  --color-cry-me-a-river-300: #9bbdd2;
  --color-cry-me-a-river-400: #7ca5bc;
  --color-cry-me-a-river-500: #5e8da7;
  --color-cry-me-a-river-600: #50778d;
  --color-cry-me-a-river-700: #406071;
  --color-cry-me-a-river-800: #2d4653;
  --color-cry-me-a-river-900: #1e313a;
  --color-cry-me-a-river-950: #0e1d24;
}

SCSS

$cry-me-a-river: #507a91;
$cry-me-a-river-rgb: 80, 122, 145;
$cry-me-a-river-light: mix(#fff, $cry-me-a-river, 20%);
$cry-me-a-river-dark: mix(#000, $cry-me-a-river, 20%);

.element {
  color: $cry-me-a-river;
  box-shadow: 0 0 0 2px rgba($cry-me-a-river, 0.35);
}