Heavy Blue

CSS

:root {
  --heavy-blue: #2c5674;
  --heavy-blue-rgb: 44 86 116;
  --heavy-blue-oklch: oklch(0.437 0.068 241.7);
}

.element {
  color: var(--heavy-blue);
  background-color: hsl(205 45% 31%);
  border-color: oklch(0.437 0.068 241.7);
}

Tailwind CSS v4

@theme {
  --color-heavy-blue: #2c5674;
  --color-heavy-blue-50: #e5f8ff;
  --color-heavy-blue-100: #d5ebfe;
  --color-heavy-blue-200: #bcd8f0;
  --color-heavy-blue-300: #9abcd8;
  --color-heavy-blue-400: #7aa4c4;
  --color-heavy-blue-500: #5c8cb0;
  --color-heavy-blue-600: #4e7694;
  --color-heavy-blue-700: #3e5f77;
  --color-heavy-blue-800: #2c4658;
  --color-heavy-blue-900: #1d303d;
  --color-heavy-blue-950: #0d1c27;
}

SCSS

$heavy-blue: #2c5674;
$heavy-blue-rgb: 44, 86, 116;
$heavy-blue-light: mix(#fff, $heavy-blue, 20%);
$heavy-blue-dark: mix(#000, $heavy-blue, 20%);

.element {
  color: $heavy-blue;
  box-shadow: 0 0 0 2px rgba($heavy-blue, 0.35);
}