XF 2.0 How to configure fluid layout style?

Style Properties -> Page Setup -> Maximum page width, change to 100% or whichever you'd like.

How to make fluid with boxed layout? This code not working in in extra.less.

Code:
.p-pageWrapper {
    max-width: 1200px;
    margin: 0 auto;
    background-color: #FFF;
    padding: 10px;
}
 
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