#0076E4

CSS

:root {
  --fading-night: #0076e4;
  --fading-night-rgb: 0 118 228;
  --fading-night-oklch: oklch(0.574 0.189 254.9);
}

.element {
  color: var(--fading-night);
  background-color: hsl(209 100% 45%);
  border-color: oklch(0.574 0.189 254.9);
}

Tailwind CSS v4

@theme {
  --color-fading-night: #0076e4;
  --color-fading-night-50: #d3f8ff;
  --color-fading-night-100: #c0ebff;
  --color-fading-night-200: #a0d7ff;
  --color-fading-night-300: #76b9ff;
  --color-fading-night-400: #459fff;
  --color-fading-night-500: #0083fe;
  --color-fading-night-600: #036fd6;
  --color-fading-night-700: #0659ad;
  --color-fading-night-800: #004281;
  --color-fading-night-900: #002e5b;
  --color-fading-night-950: #001a3e;
}

SCSS

$fading-night: #0076e4;
$fading-night-rgb: 0, 118, 228;
$fading-night-light: mix(#fff, $fading-night, 20%);
$fading-night-dark: mix(#000, $fading-night, 20%);

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