#3D7C97

CSS

:root {
  --cry-me-a-river: #3d7c97;
  --cry-me-a-river-rgb: 61 124 151;
  --cry-me-a-river-oklch: oklch(0.556 0.077 228.5);
}

.element {
  color: var(--cry-me-a-river);
  background-color: hsl(198 42% 42%);
  border-color: oklch(0.556 0.077 228.5);
}

Tailwind CSS v4

@theme {
  --color-cry-me-a-river: #3d7c97;
  --color-cry-me-a-river-50: #e0faff;
  --color-cry-me-a-river-100: #cfedfd;
  --color-cry-me-a-river-200: #b4dbef;
  --color-cry-me-a-river-300: #8fbfd8;
  --color-cry-me-a-river-400: #6ca8c3;
  --color-cry-me-a-river-500: #4990af;
  --color-cry-me-a-river-600: #3f7a93;
  --color-cry-me-a-river-700: #326276;
  --color-cry-me-a-river-800: #224857;
  --color-cry-me-a-river-900: #17323d;
  --color-cry-me-a-river-950: #071e26;
}

SCSS

$cry-me-a-river: #3d7c97;
$cry-me-a-river-rgb: 61, 124, 151;
$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);
}