#53A2D4

CSS

:root {
  --sub-zero: #53a2d4;
  --sub-zero-rgb: 83 162 212;
  --sub-zero-oklch: oklch(0.683 0.107 238.8);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(203 60% 58%);
  border-color: oklch(0.683 0.107 238.8);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #53a2d4;
  --color-sub-zero-50: #dbfaff;
  --color-sub-zero-100: #c9edff;
  --color-sub-zero-200: #acdbfe;
  --color-sub-zero-300: #85bfe9;
  --color-sub-zero-400: #5da7d7;
  --color-sub-zero-500: #328fc5;
  --color-sub-zero-600: #2d79a6;
  --color-sub-zero-700: #246185;
  --color-sub-zero-800: #154763;
  --color-sub-zero-900: #0e3145;
  --color-sub-zero-950: #011d2d;
}

SCSS

$sub-zero: #53a2d4;
$sub-zero-rgb: 83, 162, 212;
$sub-zero-light: mix(#fff, $sub-zero, 20%);
$sub-zero-dark: mix(#000, $sub-zero, 20%);

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