ion.rangeSlider
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Various improvements to modern CSS:
Before these changes, the modern theme's handle sizing and grid text positioning looks a bit off
![Screen Shot 2020-07-02 at 9 49 31 AM](https://user-images.githubusercontent.com/1365941/86375275-117a0580-bc4b-11ea-885d-5ae025f74a98.png)
After these changes, it looks slightly better by default
![Screen Shot 2020-07-02 at 9 53 00 AM](https://user-images.githubusercontent.com/1365941/86375298-1939aa00-bc4b-11ea-8d10-cece50d37080.png)