#4E7A91

CSS

:root {
  --cry-me-a-river: #4e7a91;
  --cry-me-a-river-rgb: 78 122 145;
  --cry-me-a-river-oklch: oklch(0.557 0.06 232.1);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(201 30% 44%);
  border-color: oklch(0.557 0.06 232.1);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #4e7a91;
  --color-cry-me-a-river-50: #e5f9ff;
  --color-cry-me-a-river-100: #d5ecf9;
  --color-cry-me-a-river-200: #bcd9ea;
  --color-cry-me-a-river-300: #9abdd2;
  --color-cry-me-a-river-400: #7aa5bc;
  --color-cry-me-a-river-500: #5c8ea8;
  --color-cry-me-a-river-600: #4e788e;
  --color-cry-me-a-river-700: #3e6071;
  --color-cry-me-a-river-800: #2c4653;
  --color-cry-me-a-river-900: #1e313a;
  --color-cry-me-a-river-950: #0d1d24;
}

SCSS

$cry-me-a-river: #4e7a91;
$cry-me-a-river-rgb: 78, 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);
}