It is very easy to make your SilverStripe CMS website compatible to mobile devices! Use this simple css in your theme:

@media screen and (min-width:480px) { 
    /* for normal screens */

    #Header { height:200px;}
    #MainPage { width:80%;}
    #Content { padding: 40px;}

}

@media screen and (max-width:480px) { 
    /* for small screens */

    #Header { height:40px; }
    #footer { display:none; }
    #MainPage { width:100%}    
    #Content { padding: 5px;}    

}

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