indexeddb-examples/idbkeyrange: bad UX

[OnkarRuikar]

The font sizes are huge. It is not easy to understand what's going on especially on smart phones:

https://user-images.githubusercontent.com/87750369/181191966-6767a74c-3d42-4f2e-8e02-20cafb145e30.mp4

The radio buttons are smaller. In first glance it's not recognizable that we are supposed to select radio options and input ranges and hit the run square box.

[bsmth]

The example is using floats etc. It looks like it could use a general refresh / styles could be rewritten from scratch for this:

https://github.com/mdn/dom-examples/blob/main/indexeddb-examples/idbkeyrange/style/style.css

edit: assigning myself for this one if you'd like to review a PR for it at some point.