#48A4CF

CSS

:root {
  --mystic-blue: #48a4cf;
  --mystic-blue-rgb: 72 164 207;
  --mystic-blue-oklch: oklch(0.681 0.107 231.6);
}

.element {
  color: var(--mystic-blue);
  background-color: hsl(199 58% 55%);
  border-color: oklch(0.681 0.107 231.6);
}

Tailwind CSS v4

@theme {
  --color-mystic-blue: #48a4cf;
  --color-mystic-blue-50: #d8fbff;
  --color-mystic-blue-100: #c6efff;
  --color-mystic-blue-200: #a7ddfb;
  --color-mystic-blue-300: #7ec1e6;
  --color-mystic-blue-400: #54aad3;
  --color-mystic-blue-500: #1f92c0;
  --color-mystic-blue-600: #1e7ba2;
  --color-mystic-blue-700: #196382;
  --color-mystic-blue-800: #0c4960;
  --color-mystic-blue-900: #083343;
  --color-mystic-blue-950: #001e2b;
}

SCSS

$mystic-blue: #48a4cf;
$mystic-blue-rgb: 72, 164, 207;
$mystic-blue-light: mix(#fff, $mystic-blue, 20%);
$mystic-blue-dark: mix(#000, $mystic-blue, 20%);

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