#457B97

CSS

:root {
  --cry-me-a-river: #457b97;
  --cry-me-a-river-rgb: 69 123 151;
  --cry-me-a-river-oklch: oklch(0.557 0.072 232.7);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(200 37% 43%);
  border-color: oklch(0.557 0.072 232.7);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #457b97;
  --color-cry-me-a-river-50: #e2f9ff;
  --color-cry-me-a-river-100: #d2ecfd;
  --color-cry-me-a-river-200: #b7daef;
  --color-cry-me-a-river-300: #94bed7;
  --color-cry-me-a-river-400: #73a6c2;
  --color-cry-me-a-river-500: #528fae;
  --color-cry-me-a-river-600: #467993;
  --color-cry-me-a-river-700: #386176;
  --color-cry-me-a-river-800: #264757;
  --color-cry-me-a-river-900: #1a313d;
  --color-cry-me-a-river-950: #0a1d26;
}

SCSS

$cry-me-a-river: #457b97;
$cry-me-a-river-rgb: 69, 123, 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);
}