#5E54CA

CSS

:root {
  --warm-blue: #5e54ca;
  --warm-blue-rgb: 94 84 202;
  --warm-blue-oklch: oklch(0.521 0.177 282.2);
}

.element {
  color: var(--warm-blue);
  background-color: hsl(245 53% 56%);
  border-color: oklch(0.521 0.177 282.2);
}

Tailwind CSS v4

@theme {
  --color-warm-blue: #5e54ca;
  --color-warm-blue-50: #eeefff;
  --color-warm-blue-100: #e0e1ff;
  --color-warm-blue-200: #cbcaff;
  --color-warm-blue-300: #adaaff;
  --color-warm-blue-400: #908eff;
  --color-warm-blue-500: #786ff6;
  --color-warm-blue-600: #665fcf;
  --color-warm-blue-700: #514ca7;
  --color-warm-blue-800: #39377d;
  --color-warm-blue-900: #272658;
  --color-warm-blue-950: #15143c;
}

SCSS

$warm-blue: #5e54ca;
$warm-blue-rgb: 94, 84, 202;
$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);
}