Sleepless Blue

CSS

:root {
  --sleepless-blue: #badbed;
  --sleepless-blue-rgb: 186 219 237;
  --sleepless-blue-oklch: oklch(0.873 0.043 231.8);
}

.element {
  color: var(--sleepless-blue);
  background-color: hsl(201 59% 83%);
  border-color: oklch(0.873 0.043 231.8);
}

Tailwind CSS v4

@theme {
  --color-sleepless-blue: #badbed;
  --color-sleepless-blue-50: #eaf8ff;
  --color-sleepless-blue-100: #dbebf4;
  --color-sleepless-blue-200: #c3d8e4;
  --color-sleepless-blue-300: #a3bcca;
  --color-sleepless-blue-400: #86a3b4;
  --color-sleepless-blue-500: #6a8c9e;
  --color-sleepless-blue-600: #5a7686;
  --color-sleepless-blue-700: #475f6b;
  --color-sleepless-blue-800: #33454e;
  --color-sleepless-blue-900: #233037;
  --color-sleepless-blue-950: #121c21;
}

SCSS

$sleepless-blue: #badbed;
$sleepless-blue-rgb: 186, 219, 237;
$sleepless-blue-light: mix(#fff, $sleepless-blue, 20%);
$sleepless-blue-dark: mix(#000, $sleepless-blue, 20%);

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