ピクセルの倍率
https://gyazo.com/1dcbafe3c96968b519f5c5b254bfd89a
https://docs.google.com/spreadsheets/d/1ayUhoIEbbWeME66Ihz_fWcOZHooL64dg6NLBnV8jPuM/edit#gid=0
#Webデザイン