Chi-K
You can update above code to:
@media (max-width: 480px) {
.vm-col.product,
.layout-home-3 .vm-categories-wall .vm-categories-wall-catwrapper {
width: 49% !important;
flex: none !important;
}
.product-related-products .product-field {
width: 49%;
float: left;
}
}