Using @contentBackground in external PHP script

[AndyB]

Hello,

I'm creating an add-on which uses an external PHP script, the script is being called by XenForo in an iFrame. The script has its own CSS where I define the following:

.wrapper {
    margin: 0 auto;
    padding: 1em 2em;
    display: inline-block;
    background-color: @contentBackground;
    border: 1px solid @primaryMedium;
    border-radius: 5px;
}

The @contentBackground works properly, however the @primaryMedium does not. Can someone please explain why only the @contentBackground is working.

Thank you.

 

[AndyB]

I just figured out what is going on. The @contentBackground isn't working either, I just thought it was.

 

[Marcus]

regarding the @ in css: xenforo uses http://lessphp.gpeasy.com/ which is based on http://lesscss.org/