#D7EFED

CSS

:root {
  --queen-of-waves: #d7efed;
  --queen-of-waves-rgb: 215 239 237;
  --queen-of-waves-oklch: oklch(0.934 0.025 190.7);
}

.element {
  color: var(--queen-of-waves);
  background-color: hsl(175 43% 89%);
  border-color: oklch(0.934 0.025 190.7);
}

Tailwind CSS v4

@theme {
  --color-queen-of-waves: #d7efed;
  --color-queen-of-waves-50: #edf8f7;
  --color-queen-of-waves-100: #dfebea;
  --color-queen-of-waves-200: #c9d8d7;
  --color-queen-of-waves-300: #a9bcbb;
  --color-queen-of-waves-400: #8ea4a2;
  --color-queen-of-waves-500: #748c8a;
  --color-queen-of-waves-600: #627675;
  --color-queen-of-waves-700: #4e5f5d;
  --color-queen-of-waves-800: #394544;
  --color-queen-of-waves-900: #27302f;
  --color-queen-of-waves-950: #151c1c;
}

SCSS

$queen-of-waves: #d7efed;
$queen-of-waves-rgb: 215, 239, 237;
$queen-of-waves-light: mix(#fff, $queen-of-waves, 20%);
$queen-of-waves-dark: mix(#000, $queen-of-waves, 20%);

.element {
  color: $queen-of-waves;
  box-shadow: 0 0 0 2px rgba($queen-of-waves, 0.35);
}