Which technic are this site using for there images?
I wonder what technic this site is using for there images:
http://www.tjallamalla.com/collections/latest

Try to adjust the browser window and you will se that the images are automatically getting smaller/bigger depending on if you make the browser window smaler or larger.

Which technic are there using? I've tried to look into the source code, but haven't understand what is doing this. 

Would be lovely if there is any good tutorials on this.
Which technic are this site using for there images?
===

I wonder what technic this site is using for there images:
http://www.tjallamalla.com/collections/latest

Try to adjust the browser window and you will se that the images are automatically getting smaller/bigger depending on if you make the browser window smaler or larger.

Which technic are there using? I've tried to look into the source code, but haven't understand what is doing this. 

Would be lovely if there is any good tutorials on this.