#4C7C86

CSS

:root {
  --mysterious-blue: #4c7c86;
  --mysterious-blue-rgb: 76 124 134;
  --mysterious-blue-oklch: oklch(0.556 0.054 212.3);
}

.element {
  color: var(--mysterious-blue);
  background-color: hsl(190 28% 41%);
  border-color: oklch(0.556 0.054 212.3);
}

Tailwind CSS v4

@theme {
  --color-mysterious-blue: #4c7c86;
  --color-mysterious-blue-50: #e5faff;
  --color-mysterious-blue-100: #d4edf3;
  --color-mysterious-blue-200: #bbdbe3;
  --color-mysterious-blue-300: #98bfc9;
  --color-mysterious-blue-400: #79a7b1;
  --color-mysterious-blue-500: #5a909b;
  --color-mysterious-blue-600: #4d7a83;
  --color-mysterious-blue-700: #3d6269;
  --color-mysterious-blue-800: #2b484d;
  --color-mysterious-blue-900: #1d3235;
  --color-mysterious-blue-950: #0d1e21;
}

SCSS

$mysterious-blue: #4c7c86;
$mysterious-blue-rgb: 76, 124, 134;
$mysterious-blue-light: mix(#fff, $mysterious-blue, 20%);
$mysterious-blue-dark: mix(#000, $mysterious-blue, 20%);

.element {
  color: $mysterious-blue;
  box-shadow: 0 0 0 2px rgba($mysterious-blue, 0.35);
}