#6D9CE5

CSS

:root {
  --blue-bay: #6d9ce5;
  --blue-bay-rgb: 109 156 229;
  --blue-bay-oklch: oklch(0.69 0.12 258.9);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(217 70% 66%);
  border-color: oklch(0.69 0.12 258.9);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #6d9ce5;
  --color-blue-bay-50: #e2f6ff;
  --color-blue-bay-100: #d2e9ff;
  --color-blue-bay-200: #b8d5ff;
  --color-blue-bay-300: #95b8f5;
  --color-blue-bay-400: #739fe5;
  --color-blue-bay-500: #5386d5;
  --color-blue-bay-600: #4771b3;
  --color-blue-bay-700: #385b90;
  --color-blue-bay-800: #26436b;
  --color-blue-bay-900: #192e4b;
  --color-blue-bay-950: #0a1b32;
}

SCSS

$blue-bay: #6d9ce5;
$blue-bay-rgb: 109, 156, 229;
$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);
}