Logos have a grey background and are cropped

Hello!

I’ve used the plugin before in other websites and i loved it! However, actually i’m having some trouble…

The logos (PNG) have a grey background and some are cropped by the slider, as you can see in the screenshot: https://s2.postimg.org/jcnqkvryx/Captura_de_ecr_2017-05-31_s_19.39.06.png

About the grey background i’ve found a class .help that’s causing it, but i couldn’t deactivate it even in custom css. Any suggestions?

You can check it out here: http://www.florineve.pt/2017/

Thank you