Independent Publisher 2 centered content

Hello!
I’m just setting up a wordpress blog using this nice theme but I find that the content is not centered like the demo shows.

Have been looking around this support forum and found that CSS is required which means that a paying plan must be used.

Would like to know if this is true. If the demo shows content centered then honestly I think that this is how it should be in the free version of the theme.

Any help with this?

Thanks a lot!!! ??