[Theme: Encrypted Lite] Center Page

it looks like that theme was intended to have a sidebar. when you are in the edit page screen on the right hand side under page attributes is there a template that is ‘full width’ or something similar?

if no such option exists you can accopmlish what you want by add the following to your custom css or at the bottom of your child theme style.css file.

#primary {
    display: block;
    float: none;
    margin: 0 auto;
}

NOTE: depending on the layout of other pages on your site, that code may have undesired results and will need to be deleted to restore default behavior.