I have a page where multiple amazon affiliate links will be displayed on the page like so.
{amazon.map((amazon) => (
<div className="col-sm-4" key={amazon.link}>
<iframe
style={{height: '300px', width: '300px'}}
marginwidth="0"
marginheight="0"
scrolling="no"
frameborder="0"
src={amazon.link}
></iframe>
</div>
))}
This is working fine, (the links are stored in a json file). However when I try to make the thumbnails of the images larger, the images stays the same size and the width/height between the affiliate items grows larger.

How am I able to style the products?
Thank you in advance.
Just in case it's needed: