#94CFE9

CSS

:root {
  --below-zero: #94cfe9;
  --below-zero-rgb: 148 207 233;
  --below-zero-oklch: oklch(0.823 0.071 227.2);
}

.element {
  color: var(--below-zero);
  background-color: hsl(198 66% 75%);
  border-color: oklch(0.823 0.071 227.2);
}

Tailwind CSS v4

@theme {
  --color-below-zero: #94cfe9;
  --color-below-zero-50: #e1faff;
  --color-below-zero-100: #d1edfb;
  --color-below-zero-200: #b6dbed;
  --color-below-zero-300: #92bfd5;
  --color-below-zero-400: #71a7bf;
  --color-below-zero-500: #4f90ab;
  --color-below-zero-600: #447a90;
  --color-below-zero-700: #366174;
  --color-below-zero-800: #254855;
  --color-below-zero-900: #19323b;
  --color-below-zero-950: #091d25;
}

SCSS

$below-zero: #94cfe9;
$below-zero-rgb: 148, 207, 233;
$below-zero-light: mix(#fff, $below-zero, 20%);
$below-zero-dark: mix(#000, $below-zero, 20%);

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