#5954F5

CSS

:root {
  --warm-blue: #5954f5;
  --warm-blue-rgb: 89 84 245;
  --warm-blue-oklch: oklch(0.552 0.232 277);
}

.element {
  color: var(--warm-blue);
  background-color: hsl(242 89% 65%);
  border-color: oklch(0.552 0.232 277);
}

Tailwind CSS v4

@theme {
  --color-warm-blue: #5954f5;
  --color-warm-blue-50: #e6efff;
  --color-warm-blue-100: #d7e0ff;
  --color-warm-blue-200: #bfc9ff;
  --color-warm-blue-300: #a0a7ff;
  --color-warm-blue-400: #8188ff;
  --color-warm-blue-500: #6965ff;
  --color-warm-blue-600: #5956ee;
  --color-warm-blue-700: #4745bf;
  --color-warm-blue-800: #2f3390;
  --color-warm-blue-900: #202366;
  --color-warm-blue-950: #111047;
}

SCSS

$warm-blue: #5954f5;
$warm-blue-rgb: 89, 84, 245;
$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);
}