I've been fiddling with some annoying data-attribure tag. Webmin gives admins the opportunity to adjust the frontend through css but it is with your hands tied behind your back.
I want to change the color of "Send mail" button green with css:
The targeted HTML:
<div class="btn-group end_submits"><button class="btn btn-default ui_submit ui_form_end_submit" type="button"> <span data-entry="reply_send">Send Mail </span></button>