#709BE6

CSS

:root {
  --blue-bay: #709be6;
  --blue-bay-rgb: 112 155 230;
  --blue-bay-oklch: oklch(0.69 0.121 261);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(218 70% 67%);
  border-color: oklch(0.69 0.121 261);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #709be6;
  --color-blue-bay-50: #e3f6ff;
  --color-blue-bay-100: #d3e9ff;
  --color-blue-bay-200: #b9d5ff;
  --color-blue-bay-300: #97b7f6;
  --color-blue-bay-400: #759ee6;
  --color-blue-bay-500: #5785d6;
  --color-blue-bay-600: #4a70b4;
  --color-blue-bay-700: #3b5a91;
  --color-blue-bay-800: #28426c;
  --color-blue-bay-900: #1a2e4c;
  --color-blue-bay-950: #0b1a32;
}

SCSS

$blue-bay: #709be6;
$blue-bay-rgb: 112, 155, 230;
$blue-bay-light: mix(#fff, $blue-bay, 20%);
$blue-bay-dark: mix(#000, $blue-bay, 20%);

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