Mobile Banner not Resizing / Cut-off

Site URL: https://cjstingerart.com/

Hi, I have an image block as my banner. And it shows fine when viewed on a desktop, but on a mobile it is cut-off. The image does not resize at all when viewed on a mobile. I don't know anything about coding. Can you please help? Thank you!

Hi. Add to Design > Custom CSS

/* resize mobile banner */
@media screen and (max-width:767px) {
body.homepage #page section:first-child {
    min-height: 10vh;
}
}