Hi @fxground,
Thanks for reaching out.
There is no such option for the effect you want in the border as shown in the given example URL. What you are trying to achieve is required custom CSS, which is beyond the scope of Theme Support. I would suggest you hire a developer who can assist you with the customization, or you can avail of our newly launched service called One, where we answer questions beyond normal theme support.
Alternatively, you can add the specific class name to any container element like DIV and check if that CSS works after adding in the Page CSS.
We really do not provide support for custom codes, which means we can’t fix it in case it conflicts with something on your site, nor will we enhance it. On further customization should be directed to a third-party developer, or you can avail of One, where we answer the questions beyond normal theme support.
Thanks