Resize Banner Slideshow Images on Mobile

Site URL: https://www.wynnsautodetailing.com/

The images on the banner slideshow on my home screen are way too big and gets cut off when viewed on a mobile platform. I have not been able to find a css code that helps or changes anything about the sizing of the images. Can someone help out with this? 

Try adding to Design > Custom CSS

@media screen and (max-width:767px) {
/* List section height */
.user-items-list-item-container[data-section-id="62ec8ab9d8625f1bdc3e76e8"] ul {
    min-height: unset !important;
}
}