#6F9BE6

CSS

:root {
  --blue-bay: #6f9be6;
  --blue-bay-rgb: 111 155 230;
  --blue-bay-oklch: oklch(0.689 0.121 260.6);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(218 70% 67%);
  border-color: oklch(0.689 0.121 260.6);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #6f9be6;
  --color-blue-bay-50: #e3f6ff;
  --color-blue-bay-100: #d3e9ff;
  --color-blue-bay-200: #b9d5ff;
  --color-blue-bay-300: #96b8f6;
  --color-blue-bay-400: #759fe6;
  --color-blue-bay-500: #5685d6;
  --color-blue-bay-600: #4971b4;
  --color-blue-bay-700: #3a5a91;
  --color-blue-bay-800: #27426c;
  --color-blue-bay-900: #1a2e4c;
  --color-blue-bay-950: #0b1a32;
}

SCSS

$blue-bay: #6f9be6;
$blue-bay-rgb: 111, 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);
}