#6CBCF8

CSS

:root {
  --hello-summer: #6cbcf8;
  --hello-summer-rgb: 108 188 248;
  --hello-summer-oklch: oklch(0.768 0.117 242.7);
}

.element {
  color: var(--hello-summer);
  background-color: hsl(206 91% 70%);
  border-color: oklch(0.768 0.117 242.7);
}

Tailwind CSS v4

@theme {
  --color-hello-summer: #6cbcf8;
  --color-hello-summer-50: #dafaff;
  --color-hello-summer-100: #c8edff;
  --color-hello-summer-200: #aadaff;
  --color-hello-summer-300: #83bef0;
  --color-hello-summer-400: #5ba6de;
  --color-hello-summer-500: #2f8ecd;
  --color-hello-summer-600: #2a78ad;
  --color-hello-summer-700: #22608b;
  --color-hello-summer-800: #134767;
  --color-hello-summer-900: #0c3148;
  --color-hello-summer-950: #011d2f;
}

SCSS

$hello-summer: #6cbcf8;
$hello-summer-rgb: 108, 188, 248;
$hello-summer-light: mix(#fff, $hello-summer, 20%);
$hello-summer-dark: mix(#000, $hello-summer, 20%);

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