#507C96

CSS

:root {
  --cry-me-a-river: #507c96;
  --cry-me-a-river-rgb: 80 124 150;
  --cry-me-a-river-oklch: oklch(0.565 0.063 235.4);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(202 30% 45%);
  border-color: oklch(0.565 0.063 235.4);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #507c96;
  --color-cry-me-a-river-50: #e5f8ff;
  --color-cry-me-a-river-100: #d5ecfb;
  --color-cry-me-a-river-200: #bcd9ec;
  --color-cry-me-a-river-300: #9abdd4;
  --color-cry-me-a-river-400: #7aa5bf;
  --color-cry-me-a-river-500: #5c8daa;
  --color-cry-me-a-river-600: #4e7790;
  --color-cry-me-a-river-700: #3e6073;
  --color-cry-me-a-river-800: #2c4655;
  --color-cry-me-a-river-900: #1d313b;
  --color-cry-me-a-river-950: #0d1d25;
}

SCSS

$cry-me-a-river: #507c96;
$cry-me-a-river-rgb: 80, 124, 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);
}