How to change Boxed style width in Wordpress Liber theme

1. Go to Appearance

2. Then go to Customize

3. Then click Additional CSS

4. Then add this code:

.box-style .page-wrap {

    padding: 70px 10%;

    background: #ebefe3;

    text-align: center;

}

you can set the width by changing this line

padding: 70px 10%

change to something like this:

padding: 80px 40%

You will see that your box width changed.