#417D9C

CSS

:root {
  --cry-me-a-river: #417d9c;
  --cry-me-a-river-rgb: 65 125 156;
  --cry-me-a-river-oklch: oklch(0.562 0.079 233.1);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(200 41% 43%);
  border-color: oklch(0.562 0.079 233.1);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #417d9c;
  --color-cry-me-a-river-50: #e0f9ff;
  --color-cry-me-a-river-100: #d0edff;
  --color-cry-me-a-river-200: #b5daf2;
  --color-cry-me-a-river-300: #90bfda;
  --color-cry-me-a-river-400: #6ea7c6;
  --color-cry-me-a-river-500: #4b8fb2;
  --color-cry-me-a-river-600: #417996;
  --color-cry-me-a-river-700: #346179;
  --color-cry-me-a-river-800: #234759;
  --color-cry-me-a-river-900: #17313e;
  --color-cry-me-a-river-950: #081d27;
}

SCSS

$cry-me-a-river: #417d9c;
$cry-me-a-river-rgb: 65, 125, 156;
$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);
}