#457B92

CSS

:root {
  --cry-me-a-river: #457b92;
  --cry-me-a-river-rgb: 69 123 146;
  --cry-me-a-river-oklch: oklch(0.555 0.068 227.5);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(198 36% 42%);
  border-color: oklch(0.555 0.068 227.5);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #457b92;
  --color-cry-me-a-river-50: #e2f9ff;
  --color-cry-me-a-river-100: #d2edfa;
  --color-cry-me-a-river-200: #b8daec;
  --color-cry-me-a-river-300: #94bfd3;
  --color-cry-me-a-river-400: #73a7be;
  --color-cry-me-a-river-500: #528fa9;
  --color-cry-me-a-river-600: #47798f;
  --color-cry-me-a-river-700: #386173;
  --color-cry-me-a-river-800: #274754;
  --color-cry-me-a-river-900: #1a313b;
  --color-cry-me-a-river-950: #0a1d25;
}

SCSS

$cry-me-a-river: #457b92;
$cry-me-a-river-rgb: 69, 123, 146;
$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);
}