#91D1FF

CSS

:root {
  --clear-sky: #91d1ff;
  --clear-sky-rgb: 145 209 255;
  --clear-sky-oklch: oklch(0.834 0.092 240.5);
}

.element {
  color: var(--clear-sky);
  background-color: hsl(205 100% 78%);
  border-color: oklch(0.834 0.092 240.5);
}

Tailwind CSS v4

@theme {
  --color-clear-sky: #91d1ff;
  --color-clear-sky-50: #dff9ff;
  --color-clear-sky-100: #ceecff;
  --color-clear-sky-200: #b3daf9;
  --color-clear-sky-300: #8ebee3;
  --color-clear-sky-400: #6ba6d0;
  --color-clear-sky-500: #478ebd;
  --color-clear-sky-600: #3d78a0;
  --color-clear-sky-700: #316080;
  --color-clear-sky-800: #20475f;
  --color-clear-sky-900: #153142;
  --color-clear-sky-950: #061d2b;
}

SCSS

$clear-sky: #91d1ff;
$clear-sky-rgb: 145, 209, 255;
$clear-sky-light: mix(#fff, $clear-sky, 20%);
$clear-sky-dark: mix(#000, $clear-sky, 20%);

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