#onthispage{display:none}
div#container:after{content:""; display:table; clear:both}
@media screen and (max-width:849px){
#container{margin:0;max-width:100%}
#sidebar{float:left;width:130px}
#extra{float:right;width:calc(100% - 130px)}
#footer{clear:both;width:100%}
}
@media only screen and (min-width:850px){
body.page-3col #container{margin:0;max-width:950px}
body.page-3col #wrapper{float:left;width:100%}
body.page-3col #content{margin:0 200px 0 130px}
body.page-3col #sidebar{float:left;width:130px;margin-left:-100%}
body.page-3col #extra{float:left;width:200px;margin-left:-200px}
body.page-2col #container{margin:0;max-width:850px}
body.page-2col #content{float:right;width:calc(100% - 130px)}
body.page-2col #sidebar{float:left;width:130px}
body.page-2col #extra{clear:both;width:100%}
}