How to increase the content area?

Hello Acuaron,

To make the change you want you can achieve this using custom css. Please add the following custom css to your site via either a child theme or directly from the theme options panel under General Settings -> Custom CSS:

.post-content {
    width: 742px !important;
}

I hope the above was helpful.

Kind regards,

Manoj

Thank you Manoj. My goal is something little bit different.

I use your theme with Justify gallery plugin.

This is my test site:
https://mibro.webz.cz

I would like the content area to look more like this:
https://mibro.webz.cz/wp-content/uploads/2017/03/web2-600×310.jpg

Thank you for any help.