#5659C7

CSS

:root {
  --warm-blue: #5659c7;
  --warm-blue-rgb: 86 89 199;
  --warm-blue-oklch: oklch(0.522 0.168 277.7);
}

.element {
  color: var(--warm-blue);
  background-color: hsl(238 50% 56%);
  border-color: oklch(0.522 0.168 277.7);
}

Tailwind CSS v4

@theme {
  --color-warm-blue: #5659c7;
  --color-warm-blue-50: #ebf1ff;
  --color-warm-blue-100: #dce3ff;
  --color-warm-blue-200: #c5cdff;
  --color-warm-blue-300: #a6adff;
  --color-warm-blue-400: #8892ff;
  --color-warm-blue-500: #6f75f2;
  --color-warm-blue-600: #5e63cc;
  --color-warm-blue-700: #4b4fa4;
  --color-warm-blue-800: #343a7b;
  --color-warm-blue-900: #232857;
  --color-warm-blue-950: #13153b;
}

SCSS

$warm-blue: #5659c7;
$warm-blue-rgb: 86, 89, 199;
$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);
}