#54A2D7

CSS

:root {
  --sub-zero: #54a2d7;
  --sub-zero-rgb: 84 162 215;
  --sub-zero-oklch: oklch(0.685 0.11 240.7);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(204 62% 59%);
  border-color: oklch(0.685 0.11 240.7);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #54a2d7;
  --color-sub-zero-50: #dbfaff;
  --color-sub-zero-100: #c9edff;
  --color-sub-zero-200: #acdbff;
  --color-sub-zero-300: #85beeb;
  --color-sub-zero-400: #5ea7d9;
  --color-sub-zero-500: #338ec8;
  --color-sub-zero-600: #2d78a8;
  --color-sub-zero-700: #246087;
  --color-sub-zero-800: #164764;
  --color-sub-zero-900: #0e3146;
  --color-sub-zero-950: #021d2e;
}

SCSS

$sub-zero: #54a2d7;
$sub-zero-rgb: 84, 162, 215;
$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);
}