Responsive Web Page

This page uses CSS variables, Flexbox for layout, and Media Queries for responsiveness. It adapts to different screen sizes, from mobile phones to desktop computers.

The following CSS demonstrates how to define variables and use Flexbox:

:root {
  --primary-color: #3498db;
  --spacing-unit: 16px;
}

.container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-unit);
}

@media (max-width: 600px) {
  .container {
    padding: 8px;
  }
}