#5353FC

CSS

:root {
  --warm-blue: #5353fc;
  --warm-blue-rgb: 83 83 252;
  --warm-blue-oklch: oklch(0.553 0.243 275);
}

.element {
  color: var(--warm-blue);
  background-color: hsl(240 97% 66%);
  border-color: oklch(0.553 0.243 275);
}

Tailwind CSS v4

@theme {
  --color-warm-blue: #5353fc;
  --color-warm-blue-50: #e3efff;
  --color-warm-blue-100: #d3e1ff;
  --color-warm-blue-200: #bac9ff;
  --color-warm-blue-300: #9aa7ff;
  --color-warm-blue-400: #7a88ff;
  --color-warm-blue-500: #6263ff;
  --color-warm-blue-600: #5355f4;
  --color-warm-blue-700: #4244c5;
  --color-warm-blue-800: #2b3294;
  --color-warm-blue-900: #1d2369;
  --color-warm-blue-950: #0e1049;
}

SCSS

$warm-blue: #5353fc;
$warm-blue-rgb: 83, 83, 252;
$warm-blue-light: mix(#fff, $warm-blue, 20%);
$warm-blue-dark: mix(#000, $warm-blue, 20%);

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