Why em unit is used #265
Description
Briefly ( tweet size ) describe your issue and how you discovered it.
I'm just curious - what is the reason em unit is used, instead of px. em is calculated based on font size, so when I use .container class inside element which have default font-size set to 30px, my lg breakpoint is calculated to 20 * 75em = 2250px
Expected behavior
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Actual behavior
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Steps to reproduce behavior
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