#3F7C95

CSS

:root {
  --cry-me-a-river: #3f7c95;
  --cry-me-a-river-rgb: 63 124 149;
  --cry-me-a-river-oklch: oklch(0.556 0.074 227.1);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(197 41% 42%);
  border-color: oklch(0.556 0.074 227.1);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #3f7c95;
  --color-cry-me-a-river-50: #e1faff;
  --color-cry-me-a-river-100: #d0edfc;
  --color-cry-me-a-river-200: #b5dbee;
  --color-cry-me-a-river-300: #90bfd6;
  --color-cry-me-a-river-400: #6ea8c1;
  --color-cry-me-a-river-500: #4b90ac;
  --color-cry-me-a-river-600: #417a92;
  --color-cry-me-a-river-700: #346275;
  --color-cry-me-a-river-800: #234856;
  --color-cry-me-a-river-900: #17323c;
  --color-cry-me-a-river-950: #081e26;
}

SCSS

$cry-me-a-river: #3f7c95;
$cry-me-a-river-rgb: 63, 124, 149;
$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);
}