Unused CSS classes

I ran this command on the project : grep -o '\.[a-zA-Z-][a-zA-Z-]*' app/client/css/style.css | sed -e 's/\.//' | while read class; do grep -rq $class app/client/components app/client/main.js || echo $class ; done

To detect unused css classes. There might be false positive or false negative, but it seems quite accurate (manual check shall still be performed). Here is what I retrieved got (without dups):

otf // Fonts
woff // Fonts
sidebar-navbar-collapse
sidebar-sublist
sidebar-light
sidebar-bank-header
png // Backgroud image or sprite
btn-file
import-file
add-category
btn-space-right
panel-toolbar
ellipsis
rc-color-picker-trigger // Color picker related ?
rc-color-picker-panel-inner // Color picker related ?