Reply To: solution not responsive

@hansh: Hello Hans,
Please replace the previous CSS Code I provided you with the following.

@media screen and (min-width: 1024px) {
    .up-sells ul.products li.product {
        width: 16.66%;
    }
    .columns-3 ul.products li.product:nth-child(3n+1), .related ul.products li.product:nth-child(3n+1), .upsells ul.products li.product:nth-child(3n+1), .cross-sells ul.products li.product:nth-child(3n+1) {
        clear: unset;
    }
}

Let me know if this works out!
Kind Regards,
Skandha