The document discusses user interface design using CSS3. It shows how to replicate the look of a microwave button without using graphics, using techniques like rounded corners, gradients, box shadows, and text shadows. CSS3 allows for professional, realistic designs that increase user credibility and satisfaction. The document demonstrates the button design process step-by-step and emphasizes that modern browsers support CSS3, making graphics unnecessary. It promotes a CSS framework called VitaminUI for cross-browser, themeable, creative commons user interfaces.