#3398B5

CSS

:root {
  --enchanted-well: #3398b5;
  --enchanted-well-rgb: 51 152 181;
  --enchanted-well-oklch: oklch(0.634 0.1 221);
}

.element {
  color: var(--enchanted-well);
  background-color: hsl(193 56% 45%);
  border-color: oklch(0.634 0.1 221);
}

Tailwind CSS v4

@theme {
  --color-enchanted-well: #3398b5;
  --color-enchanted-well-50: #d7fcff;
  --color-enchanted-well-100: #c5f0ff;
  --color-enchanted-well-200: #a6def4;
  --color-enchanted-well-300: #7cc3dd;
  --color-enchanted-well-400: #51acc8;
  --color-enchanted-well-500: #1495b5;
  --color-enchanted-well-600: #187e98;
  --color-enchanted-well-700: #14657a;
  --color-enchanted-well-800: #094a5a;
  --color-enchanted-well-900: #06343f;
  --color-enchanted-well-950: #001f28;
}

SCSS

$enchanted-well: #3398b5;
$enchanted-well-rgb: 51, 152, 181;
$enchanted-well-light: mix(#fff, $enchanted-well, 20%);
$enchanted-well-dark: mix(#000, $enchanted-well, 20%);

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