The front-site has a minimal but functional design so you can easily make interface changes and match it to your brand.
Bootstrap-based and css-based. 100% responsive.
It is open-source and loaded with examples.
Technical skills? the more you have the more you can do. In the most simple case you would need to make some css and html changes. You should be able to follow some simple technical instructions.
Experienced PHP developers can really take it far.