Trouble centering menu in a responsive layout in Wordpress


I am trying to center a horizontal menu in a responsive layout.  When I resize the browser larger it begins to skew left. I have a plugin that kicks in when the layout reaches smaller mobile sizes. I need the menu to stay centered no matter how large the browser size is.

The site link is below:

I am using a Wordpress theme named Striking Multiflex.

Any help would be greatly appreciated.

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Tom BeckCommented:
The link is not very useful. "Maintenance Mode"
tiabradford1984Author Commented:
I have removed the maintenance message.
Tom BeckCommented:
Try this:

style.css line 108, change margin to 0 auto {
    margin: 0 auto;
    width: 960px;

style.css line 5, take it out.

.jqueryslidemenu > ul {
    /*display: inline-block;*/

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tiabradford1984Author Commented:
Thank you.  The solution resolved my issue.
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