I am using the JS Photo module on my homepage to display the 8 most recent images. However due to the layout of the homepage the photos aren't cleanly lining up 4 to a row. See attached screengrab.

What file(s) to I have to adjust to set a custom thumbnail size?

Hi,

please put this CSS at [site location]/templates/rt_anacron/css/rt_anacron-custom.css

.joms-list--thumbnail .joms-list__item {
  width: 24% !important;
}