Add custom css for the plugin.

* Install the free plugin Jetpack (you may have this already)
* Enable the custom CSS module https://jetpack.com/support/custom-css/
* Add the following CSS:

#sidebar .instagram-pics li {
    width: 33%;
}

Depending on your theme this might not work out the box. CSS in your theme may conflict.

Thank you so much scott.

Do you have a full detail of all the CSS classes that you use on this plug in to enable more detailed CSS customization? Could not find it anywhere if you have shared it. Thanks!

@sgclark you should be able to see the classes in use by inspecting the plugin in your browser. You can also customise the classes by using a number of filters in the plugin.