#6EBFFD

CSS

:root {
  --hello-summer: #6ebffd;
  --hello-summer-rgb: 110 191 253;
  --hello-summer-oklch: oklch(0.778 0.12 243.3);
}

.element {
  color: var(--hello-summer);
  background-color: hsl(206 97% 71%);
  border-color: oklch(0.778 0.12 243.3);
}

Tailwind CSS v4

@theme {
  --color-hello-summer: #6ebffd;
  --color-hello-summer-50: #dafaff;
  --color-hello-summer-100: #c8edff;
  --color-hello-summer-200: #aadaff;
  --color-hello-summer-300: #83bef1;
  --color-hello-summer-400: #5aa6df;
  --color-hello-summer-500: #2d8dcf;
  --color-hello-summer-600: #2978ae;
  --color-hello-summer-700: #20608c;
  --color-hello-summer-800: #124768;
  --color-hello-summer-900: #0c3149;
  --color-hello-summer-950: #001d30;
}

SCSS

$hello-summer: #6ebffd;
$hello-summer-rgb: 110, 191, 253;
$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);
}