#3AA3DF

CSS

:root {
  --high-blue: #3aa3df;
  --high-blue-rgb: 58 163 223;
  --high-blue-oklch: oklch(0.682 0.129 238.3);
}

.element {
  color: var(--high-blue);
  background-color: hsl(202 72% 55%);
  border-color: oklch(0.682 0.129 238.3);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #3aa3df;
  --color-high-blue-50: #d5fbff;
  --color-high-blue-100: #c2eeff;
  --color-high-blue-200: #a2dcff;
  --color-high-blue-300: #77c0f3;
  --color-high-blue-400: #48a8e2;
  --color-high-blue-500: #0090d1;
  --color-high-blue-600: #007ab0;
  --color-high-blue-700: #04628e;
  --color-high-blue-800: #004869;
  --color-high-blue-900: #00324a;
  --color-high-blue-950: #001e30;
}

SCSS

$high-blue: #3aa3df;
$high-blue-rgb: 58, 163, 223;
$high-blue-light: mix(#fff, $high-blue, 20%);
$high-blue-dark: mix(#000, $high-blue, 20%);

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