@media only screen and (max-width: 480px) {
.product-loop.products-grid .product:nth-child(2n+1),
.sidebar-position-without .product-loop.products-grid .product:nth-child(2n+1) {
clear: none !important;
}
.sidebar-position-without .product-loop.products-grid .product:nth-child(n) {
width: 33.33%;
}
.product-loop.products-grid .product:nth-child(3n+1),
.sidebar-position-without .product-loop.products-grid .product:nth-child(3n+1) {
clear: both !important;
}
}
Regards