#3AA4DC

CSS

:root {
  --high-blue: #3aa4dc;
  --high-blue-rgb: 58 164 220;
  --high-blue-oklch: oklch(0.683 0.125 236.2);
}

.element {
  color: var(--high-blue);
  background-color: hsl(201 70% 55%);
  border-color: oklch(0.683 0.125 236.2);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #3aa4dc;
  --color-high-blue-50: #d5fbff;
  --color-high-blue-100: #c2efff;
  --color-high-blue-200: #a2ddff;
  --color-high-blue-300: #77c1f0;
  --color-high-blue-400: #48a9de;
  --color-high-blue-500: #0091cd;
  --color-high-blue-600: #007bad;
  --color-high-blue-700: #03628b;
  --color-high-blue-800: #004867;
  --color-high-blue-900: #003248;
  --color-high-blue-950: #001e2f;
}

SCSS

$high-blue: #3aa4dc;
$high-blue-rgb: 58, 164, 220;
$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);
}