#3C7E88

CSS

:root {
  --mysterious-blue: #3c7e88;
  --mysterious-blue-rgb: 60 126 136;
  --mysterious-blue-oklch: oklch(0.554 0.069 208.5);
}

.element {
  color: var(--mysterious-blue);
  background-color: hsl(188 39% 38%);
  border-color: oklch(0.554 0.069 208.5);
}

Tailwind CSS v4

@theme {
  --color-mysterious-blue: #3c7e88;
  --color-mysterious-blue-50: #e0fbff;
  --color-mysterious-blue-100: #cfeff5;
  --color-mysterious-blue-200: #b3dde5;
  --color-mysterious-blue-300: #8fc1cb;
  --color-mysterious-blue-400: #6caab4;
  --color-mysterious-blue-500: #49939e;
  --color-mysterious-blue-600: #3f7c86;
  --color-mysterious-blue-700: #32636b;
  --color-mysterious-blue-800: #23494e;
  --color-mysterious-blue-900: #173336;
  --color-mysterious-blue-950: #071e21;
}

SCSS

$mysterious-blue: #3c7e88;
$mysterious-blue-rgb: 60, 126, 136;
$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);
}