How can I resize my banners for mobile viewing?

[Abdosamer]

No, the complete code should look like this:

@media (max-width:767px){
    .unero-banners-grid ul li img {
    object-fit: cover;
    width: 100%;}

.vc_single_image-img.attachment-full {
    height: 32vh !important;
}

}