This example displays a static blue SVG canvas, using the D3.js library to select the root `<svg>` element and apply a background color. The primary visual content is defined through CSS rather than D3’s drawing functions, with a yellow, thick-stroked line style applied to elements of the class `lines`. No data is loaded or plotted; the page demonstrates basic SVG and CSS integration within a D3 framework, using `d3.select` for element selection and style manipulation.