Images not responsive. How?

Hi!

The gallery fits perfectly in mobile devices but images don’t. I love how it looks but it’s useless showing a responsive gallery if images won’t be showed in the same way… How can I fix this?

Here you have an example of my webpage using this plugin: http://sotomuebles.com/portada/feria-del-mueble-zaragoza-2014/

Thank you very much and keep going with this amazing plugin!! 😉

https://wordpress.org/plugins/responsive-gallery-grid/