#387C9B

CSS

:root {
  --cry-me-a-river: #387c9b;
  --cry-me-a-river-rgb: 56 124 155;
  --cry-me-a-river-oklch: oklch(0.556 0.083 230.6);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(199 47% 41%);
  border-color: oklch(0.556 0.083 230.6);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #387c9b;
  --color-cry-me-a-river-50: #dffaff;
  --color-cry-me-a-river-100: #cdedff;
  --color-cry-me-a-river-200: #b2dbf2;
  --color-cry-me-a-river-300: #8cbfdb;
  --color-cry-me-a-river-400: #69a8c7;
  --color-cry-me-a-river-500: #4490b3;
  --color-cry-me-a-river-600: #3b7a97;
  --color-cry-me-a-river-700: #2f6279;
  --color-cry-me-a-river-800: #1f4859;
  --color-cry-me-a-river-900: #15323e;
  --color-cry-me-a-river-950: #061e28;
}

SCSS

$cry-me-a-river: #387c9b;
$cry-me-a-river-rgb: 56, 124, 155;
$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);
}