#3FA2E7

CSS

:root {
  --high-blue: #3fa2e7;
  --high-blue-rgb: 63 162 231;
  --high-blue-oklch: oklch(0.685 0.136 243.1);
}

.element {
  color: var(--high-blue);
  background-color: hsl(205 78% 58%);
  border-color: oklch(0.685 0.136 243.1);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #3fa2e7;
  --color-high-blue-50: #d6faff;
  --color-high-blue-100: #c3eeff;
  --color-high-blue-200: #a3dbff;
  --color-high-blue-300: #79bff9;
  --color-high-blue-400: #4ba7e8;
  --color-high-blue-500: #008ed8;
  --color-high-blue-600: #0c78b7;
  --color-high-blue-700: #0c6093;
  --color-high-blue-800: #00476d;
  --color-high-blue-900: #02314d;
  --color-high-blue-950: #001d33;
}

SCSS

$high-blue: #3fa2e7;
$high-blue-rgb: 63, 162, 231;
$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);
}