#26557A

CSS

:root {
  --color-3am-in-shibuya: #26557a;
  --color-3am-in-shibuya-rgb: 38 85 122;
  --color-3am-in-shibuya-oklch: oklch(0.435 0.08 245);
}

.element {
  color: var(--color-3am-in-shibuya);
  background-color: hsl(206 53% 31%);
  border-color: oklch(0.435 0.08 245);
}

Tailwind CSS v4

@theme {
  --color-color-3am-in-shibuya: #26557a;
  --color-color-3am-in-shibuya-50: #e4f8ff;
  --color-color-3am-in-shibuya-100: #d3ebff;
  --color-color-3am-in-shibuya-200: #bad8f5;
  --color-color-3am-in-shibuya-300: #97bcdf;
  --color-color-3am-in-shibuya-400: #76a4cb;
  --color-color-3am-in-shibuya-500: #578cb8;
  --color-color-3am-in-shibuya-600: #4a769b;
  --color-color-3am-in-shibuya-700: #3b5f7d;
  --color-color-3am-in-shibuya-800: #29465c;
  --color-color-3am-in-shibuya-900: #1b3040;
  --color-color-3am-in-shibuya-950: #0b1c29;
}

SCSS

$color-3am-in-shibuya: #26557a;
$color-3am-in-shibuya-rgb: 38, 85, 122;
$color-3am-in-shibuya-light: mix(#fff, $color-3am-in-shibuya, 20%);
$color-3am-in-shibuya-dark: mix(#000, $color-3am-in-shibuya, 20%);

.element {
  color: $color-3am-in-shibuya;
  box-shadow: 0 0 0 2px rgba($color-3am-in-shibuya, 0.35);
}