#5952C5

CSS

:root {
  --warm-blue: #5952c5;
  --warm-blue-rgb: 89 82 197;
  --warm-blue-oklch: oklch(0.51 0.173 281);
}

.element {
  color: var(--warm-blue);
  background-color: hsl(244 50% 55%);
  border-color: oklch(0.51 0.173 281);
}

Tailwind CSS v4

@theme {
  --color-warm-blue: #5952c5;
  --color-warm-blue-50: #edf0ff;
  --color-warm-blue-100: #dfe1ff;
  --color-warm-blue-200: #c9cbff;
  --color-warm-blue-300: #ababff;
  --color-warm-blue-400: #8e8fff;
  --color-warm-blue-500: #7671f4;
  --color-warm-blue-600: #6460ce;
  --color-warm-blue-700: #504da6;
  --color-warm-blue-800: #37387c;
  --color-warm-blue-900: #262758;
  --color-warm-blue-950: #15143c;
}

SCSS

$warm-blue: #5952c5;
$warm-blue-rgb: 89, 82, 197;
$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);
}