Upsell Slider in Product single page

Hello There,

We have setup the Product slider for upsell in the Product single page.

Below is our site link.

Signature7 Complete Balanced – SATURDAY Sardine + Pumpkin Wet Cat Food 70g | PetMall Singapore

We would like to make the Slider size smaller, do you have any option to define the size. it looks way too big in the site.

Regards,

Arun.