#4952D0

CSS

:root {
  --warm-blue: #4952d0;
  --warm-blue-rgb: 73 82 208;
  --warm-blue-oklch: oklch(0.508 0.191 274.2);
}

.element {
  color: var(--warm-blue);
  background-color: hsl(236 59% 55%);
  border-color: oklch(0.508 0.191 274.2);
}

Tailwind CSS v4

@theme {
  --color-warm-blue: #4952d0;
  --color-warm-blue-50: #e6f1ff;
  --color-warm-blue-100: #d6e3ff;
  --color-warm-blue-200: #becdff;
  --color-warm-blue-300: #9eadff;
  --color-warm-blue-400: #7e91ff;
  --color-warm-blue-500: #6472ff;
  --color-warm-blue-600: #5561d9;
  --color-warm-blue-700: #434eaf;
  --color-warm-blue-800: #2d3983;
  --color-warm-blue-900: #1e275d;
  --color-warm-blue-950: #0f153f;
}

SCSS

$warm-blue: #4952d0;
$warm-blue-rgb: 73, 82, 208;
$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);
}