Hi, you’ve probably not added the following CSS on your page (in addition to “sm-core-css.css” and “sm-simple.css” that you already use):
<!-- #main-menu config - instance specific stuff not covered in the theme -->
<!-- Put this in an external stylesheet if you want the media query to work in IE8 (e.g. where the rest of your page styles are) -->
<style type="text/css">
@media screen and (min-width: 768px) {
#main-menu {
position:relative;
z-index:9999;
width:auto;
}
#main-menu ul {
width:12em; /* fixed width only please - you can use the "subMenusMinWidth"/"subMenusMaxWidth" script options to override this if you like */
}
}
</style>
Just include this on your page and it should be fine.