How to change Image's Width in Product Pages? (Boundless Template)

[ZiZoouStore]

Hi everyone,

I'm using Boundless Template. On product page, I edit the default template in following link:

https://community.shopify.com/c/Technical-Q-A/How-to-show-Product-Image-Gallery-on-Product-Page-Boun...

(Thanks @Lixon_Louis for sharing this template).

But in Desktop Interface, the image's width is very small. How can I edit to expand the width?

I hope you can help me solve this issue. Thank you so much.

P/s:

1. This is my product page: https://zizoou.com/products/tui-deo-cheo-nam-nu

2. I took a shot my product page:

 How to expand the image's width?