Wrong size thumb for playlist in widget

Hi,

I’m really excited about the potential for this plugin.
However, I’ve tried to use it for a Youtube playlist which appears in a widget.

I’ve played with the display settings (thumbnail – contain etc, and widget support on) but the thumbnail is way too big for the widget. I think I need a max size of about 300px

Take a look here: http://www.lovehorror.co.uk (right sidebar)

https://wordpress.org/plugins/lazy-load-for-videos/