#437D9E

CSS

:root {
  --cry-me-a-river: #437d9e;
  --cry-me-a-river-rgb: 67 125 158;
  --cry-me-a-river-oklch: oklch(0.564 0.079 235.5);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(202 40% 44%);
  border-color: oklch(0.564 0.079 235.5);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #437d9e;
  --color-cry-me-a-river-50: #e1f9ff;
  --color-cry-me-a-river-100: #d0edff;
  --color-cry-me-a-river-200: #b5daf3;
  --color-cry-me-a-river-300: #91bedc;
  --color-cry-me-a-river-400: #6fa6c7;
  --color-cry-me-a-river-500: #4d8eb4;
  --color-cry-me-a-river-600: #427998;
  --color-cry-me-a-river-700: #35607a;
  --color-cry-me-a-river-800: #24475a;
  --color-cry-me-a-river-900: #18313f;
  --color-cry-me-a-river-950: #081d28;
}

SCSS

$cry-me-a-river: #437d9e;
$cry-me-a-river-rgb: 67, 125, 158;
$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);
}