#4F7C97

CSS

:root {
  --cry-me-a-river: #4f7c97;
  --cry-me-a-river-rgb: 79 124 151;
  --cry-me-a-river-oklch: oklch(0.565 0.065 235.9);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(203 31% 45%);
  border-color: oklch(0.565 0.065 235.9);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #4f7c97;
  --color-cry-me-a-river-50: #e5f8ff;
  --color-cry-me-a-river-100: #d5ecfb;
  --color-cry-me-a-river-200: #bbd9ed;
  --color-cry-me-a-river-300: #99bdd5;
  --color-cry-me-a-river-400: #79a5c0;
  --color-cry-me-a-river-500: #5a8dac;
  --color-cry-me-a-river-600: #4d7791;
  --color-cry-me-a-river-700: #3d6074;
  --color-cry-me-a-river-800: #2b4655;
  --color-cry-me-a-river-900: #1d313c;
  --color-cry-me-a-river-950: #0d1d25;
}

SCSS

$cry-me-a-river: #4f7c97;
$cry-me-a-river-rgb: 79, 124, 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);
}