Banner not fully showing in mobile site

Site URL: http://www.sciencetutors.co.uk

Hi!

The Banner is correct on a computer but on a mobile site half of it is cut off - any ideas on how to resolve this so it can be seen fully on mobile?

Thanks so much,

Charlotte

Try adding to design > Custom CSS

/* Mobile-Homepage-Top-Banner */
@media screen and (max-width:640px) {
.banner-thumbnail-wrapper.has-description figure img {
    width: 100% !important;
    height: auto !important;
    left: 0 !important;
}
.banner-thumbnail-wrapper.has-description {
    padding-bottom: 0 !important;
    padding-top: 50px !Important;
}}