#D34347

CSS

:root {
  --poppy-red: #d34347;
  --poppy-red-rgb: 211 67 71;
  --poppy-red-oklch: oklch(0.59 0.18 23.1);
}

.element {
  color: var(--poppy-red);
  background-color: hsl(358 62% 55%);
  border-color: oklch(0.59 0.18 23.1);
}

Tailwind CSS v4

@theme {
  --color-poppy-red: #d34347;
  --color-poppy-red-50: #ffe2db;
  --color-poppy-red-100: #ffd1ca;
  --color-poppy-red-200: #ffb6ad;
  --color-poppy-red-300: #ff9088;
  --color-poppy-red-400: #f76c6a;
  --color-poppy-red-500: #e54349;
  --color-poppy-red-600: #c13a3f;
  --color-poppy-red-700: #9c2f32;
  --color-poppy-red-800: #742026;
  --color-poppy-red-900: #521519;
  --color-poppy-red-950: #36050a;
}

SCSS

$poppy-red: #d34347;
$poppy-red-rgb: 211, 67, 71;
$poppy-red-light: mix(#fff, $poppy-red, 20%);
$poppy-red-dark: mix(#000, $poppy-red, 20%);

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