This example demonstrates a minimalist SVG visualization with a solid red background, created using D3 v5 to select the SVG element and apply inline styling. The page loads D3 from a CDN and runs a bundled script that changes the SVG’s background color to red. The accompanying CSS resets the body margin and hides overflow, ensuring the red rectangle fills the viewport without scrollbars. The visualization relies on D3’s `select` API and native SVG rendering, with no additional data or interactive elements.