How to get projects like in sample perth theme?

im havcing trouble with the perth theme getting projects like your sample

this is my url

im pretty stumped as to what rows i use and how i edit the shortcode, can you please let me know how to do this?

Hello there,

I am sorry to hear you’ve run into issue.

Technically, your setup is correct. But the browser’s console tool says that your site contains the following error:

Unsafe attempt to load URL data:image/svg+xml;utf8,<svg version='1.1' xmlns='' height='0'><filter id='greyscale'><feColorMatrix type='matrix' values='0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0' /></filter></svg>#greyscale from frame with URL Domains, protocols and ports must match.

I am curious whether it happens from the first time or just a sudden? What will happen if you empty all cache from WP Super Cache plugin?