#61A2C9

CSS

:root {
  --sub-zero: #61a2c9;
  --sub-zero-rgb: 97 162 201;
  --sub-zero-oklch: oklch(0.684 0.088 236.4);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(203 49% 58%);
  border-color: oklch(0.684 0.088 236.4);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #61a2c9;
  --color-sub-zero-50: #dff9ff;
  --color-sub-zero-100: #ceedff;
  --color-sub-zero-200: #b2daf6;
  --color-sub-zero-300: #8dbee0;
  --color-sub-zero-400: #69a7cc;
  --color-sub-zero-500: #458fb9;
  --color-sub-zero-600: #3c799c;
  --color-sub-zero-700: #30617d;
  --color-sub-zero-800: #20475c;
  --color-sub-zero-900: #153141;
  --color-sub-zero-950: #061d29;
}

SCSS

$sub-zero: #61a2c9;
$sub-zero-rgb: 97, 162, 201;
$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);
}