#6F9BE7

CSS

:root {
  --blue-bay: #6f9be7;
  --blue-bay-rgb: 111 155 231;
  --blue-bay-oklch: oklch(0.69 0.123 260.8);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(218 71% 67%);
  border-color: oklch(0.69 0.123 260.8);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #6f9be7;
  --color-blue-bay-50: #e3f6ff;
  --color-blue-bay-100: #d2e9ff;
  --color-blue-bay-200: #b9d5ff;
  --color-blue-bay-300: #96b7f7;
  --color-blue-bay-400: #749ee7;
  --color-blue-bay-500: #5685d7;
  --color-blue-bay-600: #4970b5;
  --color-blue-bay-700: #3a5a91;
  --color-blue-bay-800: #27426c;
  --color-blue-bay-900: #1a2e4c;
  --color-blue-bay-950: #0b1a32;
}

SCSS

$blue-bay: #6f9be7;
$blue-bay-rgb: 111, 155, 231;
$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);
}