Button loading state

For a big online jobs-platform we made the complete design, including a fully functional HTML/CSS styleguide.

I made this little CSS-loading animation to be shown when an action is in progress.
This is done only using CSS3 animations and is fully prepared to work within all contexts and with any amount of text in the button.
The only thing backend-dev's need to do, is toggle the .a-button--loading class on the button. Easy right?