$size__site-main : 100%;
$size__site-sidebar : 25%;

$xs-min : "only screen and (min-width:none)";
$xs-max : "only screen and (max-width:520px)";
$xs-sm : "only screen (min-width: none) and (max-width:767px)";

$sm-min : "only screen and (min-width:768px)";
$sm-max : "only screen and (max-width:991px)";
$sm-md : "only screen (min-width: 768px) and (max-width:991px)";

$md-min : "only screen and (min-width:992px)";
$md-max : "only screen and (max-width:1199px)";
$md-lg : "only screen (min-width: 992px) and (max-width:1199px)";

$lg-min : "only screen and (min-width:1200px)";
$lg-max : "only screen and (max-width:none)";