#487D96

CSS

:root {
  --cry-me-a-river: #487d96;
  --cry-me-a-river-rgb: 72 125 150;
  --cry-me-a-river-oklch: oklch(0.563 0.069 230);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(199 35% 44%);
  border-color: oklch(0.563 0.069 230);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #487d96;
  --color-cry-me-a-river-50: #e3f9ff;
  --color-cry-me-a-river-100: #d2edfb;
  --color-cry-me-a-river-200: #b8daed;
  --color-cry-me-a-river-300: #95bed5;
  --color-cry-me-a-river-400: #74a6bf;
  --color-cry-me-a-river-500: #538fab;
  --color-cry-me-a-river-600: #477990;
  --color-cry-me-a-river-700: #396174;
  --color-cry-me-a-river-800: #274755;
  --color-cry-me-a-river-900: #1a313b;
  --color-cry-me-a-river-950: #0a1d25;
}

SCSS

$cry-me-a-river: #487d96;
$cry-me-a-river-rgb: 72, 125, 150;
$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);
}