Josh - I made a few minor tweaks:
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In .wrapper (line 386) changed vw to 95 and vh to 100.
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Made the same changes in .range-slider (line 412)
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I’m displaying the value beneath the control, so I commented out the tooltip stuff.
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I changed the alpha to 0.5 in line 424 to provide more contrast between the upper and lower portions of the slider.
Looks just the way I want now - and I had fun playing with it. I realize I might have to fiddle some with the released version of the code.
Thanks for this really handy control!