#655FC5

CSS

:root {
  --simply-purple: #655fc5;
  --simply-purple-rgb: 101 95 197;
  --simply-purple-oklch: oklch(0.543 0.154 282.6);
}

.element {
  color: var(--simply-purple);
  background-color: hsl(244 47% 57%);
  border-color: oklch(0.543 0.154 282.6);
}

Tailwind CSS v4

@theme {
  --color-simply-purple: #655fc5;
  --color-simply-purple-50: #eff0ff;
  --color-simply-purple-100: #e1e2ff;
  --color-simply-purple-200: #ccccff;
  --color-simply-purple-300: #afacff;
  --color-simply-purple-400: #9291f6;
  --color-simply-purple-500: #7a74e8;
  --color-simply-purple-600: #6763c3;
  --color-simply-purple-700: #524f9d;
  --color-simply-purple-800: #3a3a76;
  --color-simply-purple-900: #282853;
  --color-simply-purple-950: #161538;
}

SCSS

$simply-purple: #655fc5;
$simply-purple-rgb: 101, 95, 197;
$simply-purple-light: mix(#fff, $simply-purple, 20%);
$simply-purple-dark: mix(#000, $simply-purple, 20%);

.element {
  color: $simply-purple;
  box-shadow: 0 0 0 2px rgba($simply-purple, 0.35);
}