I'm less interested in the design problem and rather more interested in TinkerBin, the place where people are supposed to put their solutions. TinkerBin is a great little web-based applications that gives you a space to enter your HTML, CSS and Javascript, and view the results right away. Here's a sample. Here's another (these are hard to find, as there's no index). Tinkerbin is by no means alone. See also this example from JSFiddle. There's also JSBin. Here are several more sandboxes.
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