#4053D6

CSS

:root {
  --warm-blue: #4053d6;
  --warm-blue-rgb: 64 83 214;
  --warm-blue-oklch: oklch(0.509 0.2 271);
}

.element {
  color: var(--warm-blue);
  background-color: hsl(232 65% 55%);
  border-color: oklch(0.509 0.2 271);
}

Tailwind CSS v4

@theme {
  --color-warm-blue: #4053d6;
  --color-warm-blue-50: #e2f2ff;
  --color-warm-blue-100: #d1e4ff;
  --color-warm-blue-200: #b8ceff;
  --color-warm-blue-300: #96aeff;
  --color-warm-blue-400: #7492ff;
  --color-warm-blue-500: #5973ff;
  --color-warm-blue-600: #4c62df;
  --color-warm-blue-700: #3c4eb3;
  --color-warm-blue-800: #273a86;
  --color-warm-blue-900: #1a285f;
  --color-warm-blue-950: #0b1541;
}

SCSS

$warm-blue: #4053d6;
$warm-blue-rgb: 64, 83, 214;
$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);
}