Single Column Images on Mobile Site

Site URL: http://www.aasah.com/shop

Hi Everyone...I'm hoping to get some help regarding the image layout on my shop page. On the mobile version of the site, I would like the images to be a single column rather than two, which they currently are. Thanks in advance!

Add to Shop Page Settings > Advanced > Header

<style>
@media screen and (max-width:640px) {
.ProductList-item {
    clear: none !important;
    width: 100% !important;
    float: none !important;
}
.ProductList-item img {
    width: 100% !important;
    height: auto !important;
}
}
</style>

@tuanphan Thank you for your help...very much appreciated!