Hi Ibrahim Sab,
there is noway of getting the Sass file and importing here.
So,use CSS Peeper to get the exact styles,font-sizes and colors if you don’t want to inspect the window better way is to go with Inspecting the window and copying the styles from there use the shortcut key f12 for opening the inspection window.
hope this helps.
Do inspect the web page and copy the styling whichever you needed and make it as your local css file and add the class for the property in modular it will work.