Navigation zentrieren

Hallo! Kann mir jemand helfen, wie ich die Navigation zentrieren kann?

www.mein-hamburg-zimmer.de

Hier der Code:

/*--------------------------------------------------------------
## 10.1 - Main Navigation
--------------------------------------------------------------*/
.primary-navigation-wrap {
background: #303030;
}


.main-navigation-toggle {
display: none;
}


.main-navigation-menu {
position: relative;
float: left;
margin: 0;
padding: 0em 1em 2em 2em;
width: 100%;
list-style-position: outside;
list-style-type: none;
}




.main-navigation-menu li {
float: left;
}


.main-navigation-menu a {
display: block;
margin: 0;
padding: 0em 0em 0em 2em;
color: #6CA6CD;
text-decoration: none;
font-size: 20px;
font-family: 'Gudea', Tahoma, Arial;
}


.main-navigation-menu > .menu-item-has-children > a:after {
display: inline-block;
margin: 0.5em 0 0 0.3em;
content: '\f431';
vertical-align: top;
text-decoration: inherit;
font-size: 20px;
font-family: 'Genericons';
line-height: 1;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}


.main-navigation-menu a:link,
.main-navigation-menu a:visited {
color: #6CA6CD;
text-decoration: none;
}


.main-navigation-menu a:hover,
.main-navigation-menu a:active {
color: rgba(108,166,205,0.5);
}


.main-navigation-menu ul {
position: absolute;
z-index: 99;
display: none;
margin: 0;
padding: 0;
border-top: 1px solid #fff;
background: #303030;
color: #fff;
list-style-position: outside;
list-style-type: none;
}


.main-navigation-menu ul li{
position: relative;
float: none;
margin: 0;
}


.main-navigation-menu ul a {
padding: 1em;
min-width: 250px;
min-width: 16rem;
border-bottom: 1px solid rgba(255,255,255,0.1);
font-size: 17px;
font-size: 0.875rem;
}


.main-navigation-menu ul .menu-item-has-children > a:after {
display: inline-block;
margin: 0.3em 0 0 0.3em;
content: '\f431';
vertical-align: top;
text-decoration: inherit;
font-size: 17px;
font-family: 'Genericons';
line-height: 1;
-webkit-transform: rotate(270deg);
transform: rotate(270deg);
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}


.main-navigation-menu li ul ul {
top: 1px;
left: 100%;
border-top: none;
}


.main-navigation-menu li.menu-item-has-children:hover > ul,
.main-navigation-menu li.page_item_has_children:hover > ul,
.main-navigation-menu li.menu-item-has-children[aria-expanded="true"] > ul {
display: block;
}


.main-navigation-menu li.current-menu-item > a {
background: rgba(255,255,255,0.075);
}