#1EB0DD

CSS

:root {
  --mystic-blue: #1eb0dd;
  --mystic-blue-rgb: 30 176 221;
  --mystic-blue-oklch: oklch(0.706 0.129 225.6);
}

.element {
  color: var(--mystic-blue);
  background-color: hsl(194 76% 49%);
  border-color: oklch(0.706 0.129 225.6);
}

Tailwind CSS v4

@theme {
  --color-mystic-blue: #1eb0dd;
  --color-mystic-blue-50: #cffdff;
  --color-mystic-blue-100: #bbf1ff;
  --color-mystic-blue-200: #98e0ff;
  --color-mystic-blue-300: #69c5eb;
  --color-mystic-blue-400: #2cadd8;
  --color-mystic-blue-500: #0096c6;
  --color-mystic-blue-600: #007fa7;
  --color-mystic-blue-700: #006586;
  --color-mystic-blue-800: #004b63;
  --color-mystic-blue-900: #003445;
  --color-mystic-blue-950: #001f2d;
}

SCSS

$mystic-blue: #1eb0dd;
$mystic-blue-rgb: 30, 176, 221;
$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);
}