#6365AD

CSS

:root {
  --bellflower: #6365ad;
  --bellflower-rgb: 99 101 173;
  --bellflower-oklch: oklch(0.538 0.111 280.8);
}

.element {
  color: var(--bellflower);
  background-color: hsl(238 31% 53%);
  border-color: oklch(0.538 0.111 280.8);
}

Tailwind CSS v4

@theme {
  --color-bellflower: #6365ad;
  --color-bellflower-50: #f0f2ff;
  --color-bellflower-100: #e2e4ff;
  --color-bellflower-200: #cdcfff;
  --color-bellflower-300: #afb1ef;
  --color-bellflower-400: #9297df;
  --color-bellflower-500: #797cce;
  --color-bellflower-600: #6769ae;
  --color-bellflower-700: #52548c;
  --color-bellflower-800: #3a3e68;
  --color-bellflower-900: #282a49;
  --color-bellflower-950: #161830;
}

SCSS

$bellflower: #6365ad;
$bellflower-rgb: 99, 101, 173;
$bellflower-light: mix(#fff, $bellflower, 20%);
$bellflower-dark: mix(#000, $bellflower, 20%);

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