Waterline Blue

CSS

:root {
  --waterline-blue: #436bad;
  --waterline-blue-rgb: 67 107 173;
  --waterline-blue-oklch: oklch(0.53 0.114 259.9);
}

.element {
  color: var(--waterline-blue);
  background-color: hsl(217 44% 47%);
  border-color: oklch(0.53 0.114 259.9);
}

Tailwind CSS v4

@theme {
  --color-waterline-blue: #436bad;
  --color-waterline-blue-50: #e4f6ff;
  --color-waterline-blue-100: #d3e9ff;
  --color-waterline-blue-200: #bad5ff;
  --color-waterline-blue-300: #98b8f2;
  --color-waterline-blue-400: #769fe2;
  --color-waterline-blue-500: #5886d1;
  --color-waterline-blue-600: #4b71b0;
  --color-waterline-blue-700: #3c5b8e;
  --color-waterline-blue-800: #284369;
  --color-waterline-blue-900: #1b2e4a;
  --color-waterline-blue-950: #0b1b31;
}

SCSS

$waterline-blue: #436bad;
$waterline-blue-rgb: 67, 107, 173;
$waterline-blue-light: mix(#fff, $waterline-blue, 20%);
$waterline-blue-dark: mix(#000, $waterline-blue, 20%);

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