#685EC4

CSS

:root {
  --simply-purple: #685ec4;
  --simply-purple-rgb: 104 94 196;
  --simply-purple-oklch: oklch(0.543 0.154 284.5);
}

.element {
  color: var(--simply-purple);
  background-color: hsl(246 46% 57%);
  border-color: oklch(0.543 0.154 284.5);
}

Tailwind CSS v4

@theme {
  --color-simply-purple: #685ec4;
  --color-simply-purple-50: #f1efff;
  --color-simply-purple-100: #e3e1ff;
  --color-simply-purple-200: #cfcbff;
  --color-simply-purple-300: #b1abff;
  --color-simply-purple-400: #9590f5;
  --color-simply-purple-500: #7d73e6;
  --color-simply-purple-600: #6a62c2;
  --color-simply-purple-700: #554e9c;
  --color-simply-purple-800: #3c3975;
  --color-simply-purple-900: #292753;
  --color-simply-purple-950: #171537;
}

SCSS

$simply-purple: #685ec4;
$simply-purple-rgb: 104, 94, 196;
$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);
}