#357C9E

CSS

:root {
  --cry-me-a-river: #357c9e;
  --cry-me-a-river-rgb: 53 124 158;
  --cry-me-a-river-oklch: oklch(0.556 0.088 232.2);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(199 50% 41%);
  border-color: oklch(0.556 0.088 232.2);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #357c9e;
  --color-cry-me-a-river-50: #defaff;
  --color-cry-me-a-river-100: #cceeff;
  --color-cry-me-a-river-200: #b0dbf5;
  --color-cry-me-a-river-300: #8bbfde;
  --color-cry-me-a-river-400: #66a8ca;
  --color-cry-me-a-river-500: #4090b6;
  --color-cry-me-a-river-600: #387a9a;
  --color-cry-me-a-river-700: #2c627c;
  --color-cry-me-a-river-800: #1d485b;
  --color-cry-me-a-river-900: #133240;
  --color-cry-me-a-river-950: #051e29;
}

SCSS

$cry-me-a-river: #357c9e;
$cry-me-a-river-rgb: 53, 124, 158;
$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);
}