#427E97

CSS

:root {
  --cry-me-a-river: #427e97;
  --cry-me-a-river-rgb: 66 126 151;
  --cry-me-a-river-oklch: oklch(0.563 0.073 227.4);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(198 39% 43%);
  border-color: oklch(0.563 0.073 227.4);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #427e97;
  --color-cry-me-a-river-50: #e1faff;
  --color-cry-me-a-river-100: #d0edfc;
  --color-cry-me-a-river-200: #b5dbee;
  --color-cry-me-a-river-300: #91bfd6;
  --color-cry-me-a-river-400: #6fa8c0;
  --color-cry-me-a-river-500: #4c90ac;
  --color-cry-me-a-river-600: #427a91;
  --color-cry-me-a-river-700: #346175;
  --color-cry-me-a-river-800: #244856;
  --color-cry-me-a-river-900: #18323c;
  --color-cry-me-a-river-950: #081e26;
}

SCSS

$cry-me-a-river: #427e97;
$cry-me-a-river-rgb: 66, 126, 151;
$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);
}