Text goes beyond border

Hi there,
Thanks for the most useful plugin I have installed, it really gives a new life to wordpress, specially for someone who doesn’t know a lot about html, like me.

I used your plugin to create a border around text and it works great on safari. However, on chrome the text sometimes goes beyond the border. I uploaded a screenshot to my dropbox account:
https://dl.dropboxusercontent.com/u/3698415/Captura%20de%20ecr%C3%A3%202015-06-29%2C%20%C3%A0s%2016.59.14.png

Thanks,
João

URL: http://www.cniac.org/portal/cursos-pre-congresso/