#6B9FCF

CSS

:root {
  --blue-bay: #6b9fcf;
  --blue-bay-rgb: 107 159 207;
  --blue-bay-oklch: oklch(0.685 0.09 247.3);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(209 51% 62%);
  border-color: oklch(0.685 0.09 247.3);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #6b9fcf;
  --color-blue-bay-50: #e2f8ff;
  --color-blue-bay-100: #d2ebff;
  --color-blue-bay-200: #b7d8fa;
  --color-blue-bay-300: #94bce4;
  --color-blue-bay-400: #72a4d1;
  --color-blue-bay-500: #528bbf;
  --color-blue-bay-600: #4676a1;
  --color-blue-bay-700: #385e81;
  --color-blue-bay-800: #264560;
  --color-blue-bay-900: #193043;
  --color-blue-bay-950: #0a1c2b;
}

SCSS

$blue-bay: #6b9fcf;
$blue-bay-rgb: 107, 159, 207;
$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);
}