Safari has support for <input type="checkbox" switch> where a normal ☑️ checkbox turns into a toggle. You don’t strictly need the browser support to get the look, as it’s weirdly easy to replicate (based on idea from Richard Keizer). But Thomas Steiner has a more comprehensive polyfill if you want it to behave more exactly correctly, respecting writing-mode and accent-color and such.
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Two Circles, One Arrow, and Anchor Positioning
Drawing an line with arrows pointing to the center of two arbitrary elements measuring and displaying the distance between them doesn’t seem like it would be possible in CSS alone… but…