#407D9F

CSS

:root {
  --cry-me-a-river: #407d9f;
  --cry-me-a-river-rgb: 64 125 159;
  --cry-me-a-river-oklch: oklch(0.563 0.082 235.2);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(201 43% 44%);
  border-color: oklch(0.563 0.082 235.2);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #407d9f;
  --color-cry-me-a-river-50: #e0f9ff;
  --color-cry-me-a-river-100: #cfedff;
  --color-cry-me-a-river-200: #b4daf4;
  --color-cry-me-a-river-300: #90bedd;
  --color-cry-me-a-river-400: #6da7c8;
  --color-cry-me-a-river-500: #4a8fb5;
  --color-cry-me-a-river-600: #407999;
  --color-cry-me-a-river-700: #33617b;
  --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: #407d9f;
$cry-me-a-river-rgb: 64, 125, 159;
$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);
}