#6156D8

CSS

:root {
  --warm-blue: #6156d8;
  --warm-blue-rgb: 97 86 216;
  --warm-blue-oklch: oklch(0.538 0.192 281.6);
}

.element {
  color: var(--warm-blue);
  background-color: hsl(245 63% 59%);
  border-color: oklch(0.538 0.192 281.6);
}

Tailwind CSS v4

@theme {
  --color-warm-blue: #6156d8;
  --color-warm-blue-50: #edefff;
  --color-warm-blue-100: #dfe0ff;
  --color-warm-blue-200: #c9c9ff;
  --color-warm-blue-300: #aca8ff;
  --color-warm-blue-400: #8e8cff;
  --color-warm-blue-500: #776cff;
  --color-warm-blue-600: #645cd7;
  --color-warm-blue-700: #504aad;
  --color-warm-blue-800: #383682;
  --color-warm-blue-900: #26255c;
  --color-warm-blue-950: #15133f;
}

SCSS

$warm-blue: #6156d8;
$warm-blue-rgb: 97, 86, 216;
$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);
}