XF 1.5 Content width

Change max-width to the value you want, e.g.:
max-width: 1200px;

However, you are using a third party style so you will likely need to post in the resource thread as it is referencing a style property.
@loadeddiper for our styles we use a specific property for it: Style Properties -> [XB] General Setup -> Page Width

Further questions regarding specific things to our style can go in the style thread / our site if you'd like.
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