#4C507F

CSS

:root {
  --tangent-periwinkle: #4c507f;
  --tangent-periwinkle-rgb: 76 80 127;
  --tangent-periwinkle-oklch: oklch(0.449 0.077 279.1);
}

.element {
  color: var(--tangent-periwinkle);
  background-color: hsl(235 25% 40%);
  border-color: oklch(0.449 0.077 279.1);
}

Tailwind CSS v4

@theme {
  --color-tangent-periwinkle: #4c507f;
  --color-tangent-periwinkle-50: #f1f3ff;
  --color-tangent-periwinkle-100: #e3e6ff;
  --color-tangent-periwinkle-200: #ced1f5;
  --color-tangent-periwinkle-300: #b0b3df;
  --color-tangent-periwinkle-400: #949acc;
  --color-tangent-periwinkle-500: #7b81b9;
  --color-tangent-periwinkle-600: #686d9c;
  --color-tangent-periwinkle-700: #53577d;
  --color-tangent-periwinkle-800: #3c405d;
  --color-tangent-periwinkle-900: #292c41;
  --color-tangent-periwinkle-950: #17192a;
}

SCSS

$tangent-periwinkle: #4c507f;
$tangent-periwinkle-rgb: 76, 80, 127;
$tangent-periwinkle-light: mix(#fff, $tangent-periwinkle, 20%);
$tangent-periwinkle-dark: mix(#000, $tangent-periwinkle, 20%);

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