px para rem

rootSize = 16 (default)
Formula: pixelSize / rootSize
PX 		↔︎ 	   REM conversion tables
Pixels		  		  REM
1px					0.06rem
2px					0.13rem
3px					0.19rem
4px					0.3rem
5px					0.3rem
6px					0.4rem
8px					0.5rem
10px				0.6rem
12px				0.8rem
14px				0.9rem
15px				0.9rem
16px				1rem
18px				1.1rem
20px				1.3rem
24px				1.5rem
25px				1.6rem
28px				1.8rem
32px				2rem
36px				2rem
40px				3rem
44px				3rem
48px				3rem
50px				3rem
56px				4rem
64px				4rem
72px				5rem
75px				5rem
80px				5rem
90px				6rem
100px				6rem
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