#5356F5

CSS

:root {
  --warm-blue: #5356f5;
  --warm-blue-rgb: 83 86 245;
  --warm-blue-oklch: oklch(0.552 0.231 274.9);
}

.element {
  color: var(--warm-blue);
  background-color: hsl(239 89% 64%);
  border-color: oklch(0.552 0.231 274.9);
}

Tailwind CSS v4

@theme {
  --color-warm-blue: #5356f5;
  --color-warm-blue-50: #e4f0ff;
  --color-warm-blue-100: #d4e1ff;
  --color-warm-blue-200: #bbcaff;
  --color-warm-blue-300: #9ba8ff;
  --color-warm-blue-400: #7b8aff;
  --color-warm-blue-500: #6367ff;
  --color-warm-blue-600: #5359ee;
  --color-warm-blue-700: #4247c0;
  --color-warm-blue-800: #2c3490;
  --color-warm-blue-900: #1d2466;
  --color-warm-blue-950: #0e1147;
}

SCSS

$warm-blue: #5356f5;
$warm-blue-rgb: 83, 86, 245;
$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);
}