#447A9D

CSS

:root {
  --cry-me-a-river: #447a9d;
  --cry-me-a-river-rgb: 68 122 157;
  --cry-me-a-river-oklch: oklch(0.557 0.079 238.8);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(204 40% 44%);
  border-color: oklch(0.557 0.079 238.8);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #447a9d;
  --color-cry-me-a-river-50: #e2f9ff;
  --color-cry-me-a-river-100: #d1ecff;
  --color-cry-me-a-river-200: #b7d9f3;
  --color-cry-me-a-river-300: #93bddd;
  --color-cry-me-a-river-400: #72a5c8;
  --color-cry-me-a-river-500: #518db5;
  --color-cry-me-a-river-600: #457899;
  --color-cry-me-a-river-700: #37607b;
  --color-cry-me-a-river-800: #26465a;
  --color-cry-me-a-river-900: #19313f;
  --color-cry-me-a-river-950: #091d28;
}

SCSS

$cry-me-a-river: #447a9d;
$cry-me-a-river-rgb: 68, 122, 157;
$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);
}