Please improve the units of "font-size" and "letter-spacing" in the generated css source.
I want to improve the css source generated by zeplin.
Make sure you can select "rem" as the unit of "font-size". You must be able to set the route reference value.
Make sure you can choose "em" as the unit for "letter-spacing". When the target font size is specified with "vw", it is necessary to specify the relative value between characters. And the calculation is very troublesome.