Set image height

Hi,

I would like to increase the height of the image displayed, from what I can tell RPS is adjusting the height depending on the heigh tof the slider but I would like to set this to a fixed height.

ive looked through recent-posts-slider.php and tried playing with various value in this file to try and increase the height but seems Im not editing the correct part.

Can anyone assist with this? (p.s. I really just need to see an example of the code which is setting height so I can edit)

Many Thanks
Nick

https://wordpress.org/plugins/recent-posts-slider/