#699FD1

CSS

:root {
  --blue-bay: #699fd1;
  --blue-bay-rgb: 105 159 209;
  --blue-bay-oklch: oklch(0.685 0.094 247.5);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(209 53% 62%);
  border-color: oklch(0.685 0.094 247.5);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #699fd1;
  --color-blue-bay-50: #e1f8ff;
  --color-blue-bay-100: #d1ebff;
  --color-blue-bay-200: #b6d8fb;
  --color-blue-bay-300: #93bce6;
  --color-blue-bay-400: #70a4d3;
  --color-blue-bay-500: #4f8bc1;
  --color-blue-bay-600: #4476a3;
  --color-blue-bay-700: #365e83;
  --color-blue-bay-800: #254561;
  --color-blue-bay-900: #183044;
  --color-blue-bay-950: #091c2c;
}

SCSS

$blue-bay: #699fd1;
$blue-bay-rgb: 105, 159, 209;
$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);
}