21st Century Blue

CSS

:root {
  --color-21st-century-blue: #7fb9dd;
  --color-21st-century-blue-rgb: 127 185 221;
  --color-21st-century-blue-oklch: oklch(0.759 0.079 236.5);
}

.element {
  color: var(--color-21st-century-blue);
  background-color: hsl(203 58% 68%);
  border-color: oklch(0.759 0.079 236.5);
}

Tailwind CSS v4

@theme {
  --color-color-21st-century-blue: #7fb9dd;
  --color-color-21st-century-blue-50: #e1f9ff;
  --color-color-21st-century-blue-100: #d0ecff;
  --color-color-21st-century-blue-200: #b6daf3;
  --color-color-21st-century-blue-300: #92bedc;
  --color-color-21st-century-blue-400: #70a6c8;
  --color-color-21st-century-blue-500: #4e8eb4;
  --color-color-21st-century-blue-600: #437898;
  --color-color-21st-century-blue-700: #35607a;
  --color-color-21st-century-blue-800: #24475a;
  --color-color-21st-century-blue-900: #18313f;
  --color-color-21st-century-blue-950: #091d28;
}

SCSS

$color-21st-century-blue: #7fb9dd;
$color-21st-century-blue-rgb: 127, 185, 221;
$color-21st-century-blue-light: mix(#fff, $color-21st-century-blue, 20%);
$color-21st-century-blue-dark: mix(#000, $color-21st-century-blue, 20%);

.element {
  color: $color-21st-century-blue;
  box-shadow: 0 0 0 2px rgba($color-21st-century-blue, 0.35);
}