#619EE1

CSS

:root {
  --blue-bay: #619ee1;
  --blue-bay-rgb: 97 158 225;
  --blue-bay-oklch: oklch(0.686 0.118 252);
}

.element {
  color: var(--blue-bay);
  background-color: hsl(211 68% 63%);
  border-color: oklch(0.686 0.118 252);
}

Tailwind CSS v4

@theme {
  --color-blue-bay: #619ee1;
  --color-blue-bay-50: #def8ff;
  --color-blue-bay-100: #cdebff;
  --color-blue-bay-200: #b2d8ff;
  --color-blue-bay-300: #8dbbf3;
  --color-blue-bay-400: #69a2e2;
  --color-blue-bay-500: #4589d2;
  --color-blue-bay-600: #3c74b1;
  --color-blue-bay-700: #2f5d8e;
  --color-blue-bay-800: #1f4569;
  --color-blue-bay-900: #142f4a;
  --color-blue-bay-950: #061c31;
}

SCSS

$blue-bay: #619ee1;
$blue-bay-rgb: 97, 158, 225;
$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);
}