#6B9DDF

CSS

:root {
  --blue-bay: #6b9ddf;
  --blue-bay-rgb: 107 157 223;
  --blue-bay-oklch: oklch(0.688 0.112 255.7);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(214 64% 65%);
  border-color: oklch(0.688 0.112 255.7);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #6b9ddf;
  --color-blue-bay-50: #e2f7ff;
  --color-blue-bay-100: #d1eaff;
  --color-blue-bay-200: #b7d6ff;
  --color-blue-bay-300: #94b9f1;
  --color-blue-bay-400: #71a1e0;
  --color-blue-bay-500: #5188cf;
  --color-blue-bay-600: #4573ae;
  --color-blue-bay-700: #375c8c;
  --color-blue-bay-800: #254468;
  --color-blue-bay-900: #192f49;
  --color-blue-bay-950: #091b30;
}

SCSS

$blue-bay: #6b9ddf;
$blue-bay-rgb: 107, 157, 223;
$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);
}