#357BA2

CSS

:root {
  --cry-me-a-river: #357ba2;
  --cry-me-a-river-rgb: 53 123 162;
  --cry-me-a-river-oklch: oklch(0.556 0.092 236.3);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(201 51% 42%);
  border-color: oklch(0.556 0.092 236.3);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #357ba2;
  --color-cry-me-a-river-50: #defaff;
  --color-cry-me-a-river-100: #ccedff;
  --color-cry-me-a-river-200: #b0dbf8;
  --color-cry-me-a-river-300: #8bbfe2;
  --color-cry-me-a-river-400: #66a7ce;
  --color-cry-me-a-river-500: #408fbb;
  --color-cry-me-a-river-600: #38799e;
  --color-cry-me-a-river-700: #2c617f;
  --color-cry-me-a-river-800: #1d475d;
  --color-cry-me-a-river-900: #133141;
  --color-cry-me-a-river-950: #051d2a;
}

SCSS

$cry-me-a-river: #357ba2;
$cry-me-a-river-rgb: 53, 123, 162;
$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);
}