how can I set the deafault font of Notes.app

[yuica]

I got an almost new imac27 2010.When using Notes.app,the default font is very small
How can I set the default font to make it look bigger? (I know that the 10.12 version can be set through the preferences option)

 

[yuica]

Reboot into Recovery Mode,from the topbar enter the console.
csrutil enable --without fs

I tried to modify this file--- note.app/contents/resources/pad.css
from
font: @[FONT_SIZE]px @[FONT_NAME];

modified it to
font: @[FONT_SIZE]px @[FONT_NAME] font-size: 16px;
or like this
font: @[FONT_SIZE]px 18px @[FONT_NAME];

after reboot,nothing happened,the font is still the original size...