wordpress-preseed/wp-content/themes/Pirate-Rogue/css/sass/structure/_thumbnails.scss

/*
* Thumbnails
*/

.entry-thumbnail a {
    max-height: 400px;
    overflow: hidden;
}
    
@media screen and (min-width: $breakpoint-lg) {
    .entry-thumbnail a {
	max-height: 500px;
	overflow: hidden;
    }
}