Semantic-ui: top fixed menu width issue

[partitect]

i working for this 2 days, ui top fixed menu width overflow from my page width

<div class="ui left vertical sidebar menu active visible"></div><div class="ui top fixed menu"></div><div class="pusher" style="margin-top:50px!important"></div><div class="ui black inverted vertical footer segment"></div>

[esargent]

I had a very similar issue. Changing

 .ui.menu.fixed
         {width:inherit} 

rather than

{width:100%} 

fixes the problem. (and I had the menu inside a container)