#699ED8

CSS

:root {
  --blue-bay: #699ed8;
  --blue-bay-rgb: 105 158 216;
  --blue-bay-oklch: oklch(0.686 0.103 251.6);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(211 59% 63%);
  border-color: oklch(0.686 0.103 251.6);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #699ed8;
  --color-blue-bay-50: #e1f8ff;
  --color-blue-bay-100: #d1ebff;
  --color-blue-bay-200: #b6d7ff;
  --color-blue-bay-300: #93bbec;
  --color-blue-bay-400: #70a2da;
  --color-blue-bay-500: #4f8ac8;
  --color-blue-bay-600: #4475a9;
  --color-blue-bay-700: #365d88;
  --color-blue-bay-800: #244565;
  --color-blue-bay-900: #182f47;
  --color-blue-bay-950: #091c2e;
}

SCSS

$blue-bay: #699ed8;
$blue-bay-rgb: 105, 158, 216;
$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);
}