#3E7B9C

CSS

:root {
  --cry-me-a-river: #3e7b9c;
  --cry-me-a-river-rgb: 62 123 156;
  --cry-me-a-river-oklch: oklch(0.556 0.081 234.5);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(201 43% 43%);
  border-color: oklch(0.556 0.081 234.5);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #3e7b9c;
  --color-cry-me-a-river-50: #e0f9ff;
  --color-cry-me-a-river-100: #cfedff;
  --color-cry-me-a-river-200: #b4daf3;
  --color-cry-me-a-river-300: #90bedc;
  --color-cry-me-a-river-400: #6da7c8;
  --color-cry-me-a-river-500: #4a8fb4;
  --color-cry-me-a-river-600: #407998;
  --color-cry-me-a-river-700: #33617a;
  --color-cry-me-a-river-800: #22475a;
  --color-cry-me-a-river-900: #17313f;
  --color-cry-me-a-river-950: #071d28;
}

SCSS

$cry-me-a-river: #3e7b9c;
$cry-me-a-river-rgb: 62, 123, 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);
}