Центровать меню

[creator.p]

Есть хорошее, фиксированное меню. Но оно не центруется, а постоянно left, в простом и фиксированом режиме, при чем весь код в нем свален в кучу, переделка css не помогает, и имеет 2 стиля mod-style и styles. Скачано с англо сайта, кто знает как его отцентровать? Благодарность не заржавеет.
styles.css
[css]
/*
Copyright: (c) 2015
*/

#gruemenu,
#gruemenu ul,
#gruemenu ul li,
#gruemenu ul li a
{margin: 0; padding: 0;border: 0;list-style: none;line-height: 1;display: block;position: relative; -webkit-box-sizing: border-box;-moz-box-sizing: border-box;box-sizing: border-box; z-index:999999;}
#gruemenu { width: auto; }
#gruemenu > ul { box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.05); padding:0; margin:0}
#gruemenu > ul > li a {background:none}
#gruemenu > ul > li > a { padding: 18px 25px 21px 25px; border-right: 1px solid rgba(80, 80, 80, 0.12); text-decoration: none; letter-spacing: 1px;}
#gruemenu > ul > li:hover > a,
#gruemenu > ul > li > a:hover,
#gruemenu > ul > li.active > a { background: rgba(0, 0, 0, 0.1);}
#gruemenu > ul > li.has-sub > a {padding-right: 45px;}
#gruemenu > ul > li.has-sub > a::after {content: ""; position: absolute; width: 0; height: 0; border: 6px solid transparent;}
#gruemenu > ul > li.has-sub.active > a::after,
#gruemenu > ul > li.has-sub:hover > a {}
#gruemenu:after,
#gruemenu > ul:after {content: ".";display: block;clear: both; visibility: hidden; line-height: 0; height: 0;}
#gruemenu ul ul li a { text-decoration: none; padding: 11px 25px; width: 220px; box-shadow: 0 2px 2px rgba(0, 0, 0, 0.1), 1px 1px 1px rgba(0, 0, 0, 0.1), -1px 1px 1px rgba(0, 0, 0, 0.1);}
#gruemenu > ul > li > ul::after { position: absolute; display: block;}
#gruemenu ul ul li.has-sub > a::after { content: ""; position: absolute; width: 0; height: 0; border: 4px solid transparent;}

/* Mobile Menu */
#navigation-toggle, .sidr, #sidr-close { display: none }
.sidr{display:none;position:fixed;t op:0;height:100%;z-index:999999;width:320px;overflow-x:auto;overflow-y:auto; font-size:16px;background:#333;color:#ff f;}
.sidr .sidr-inner{padding:0}
.sidr .sidr-inner>p{margin-left:15px;margin-right:15px}
.sidr.right{left:auto;right:-320px}
.sidr.left{left:-320px;right:auto;}
.sidr p{font-size:16px;margin:0 0 12px}.sidr p a{color:rgba(255,255,255,0.9)}
.sidr>p{margin-left:15px;margin-right:15px}
.sidr ul{display:block;margin:0 0 15px;padding:0;border-top:1px solid #1a1a1a;border-bottom:1px solid #4d4d4d}
.sidr ul li{display:block;margin:0;line-height:48px;border-top:1px solid #4d4d4d;border-bottom:1px solid #1a1a1a}
.sidr ul li:hover,.sidr ul li.active,.sidr ul li.sidr-class-active{ background:#333;line-height:48px}
.sidr ul li:hover>a,.sidr ul li:hover>span,.sidr ul li.active>a,.sidr ul li.active>span,.sidr ul li.sidr-class-active>a,.sidr ul li.sidr-class-active>span{}
.sidr ul li a,.sidr ul li span{padding:0 15px;display:block;text-decoration:none;color:#fff}
.sidr ul li ul{border-bottom:none;margin:0}.sidr ul li ul li{line-height:40px;font-size:14px}.sidr ul li ul li:last-child{border-bottom:none}
.sidr ul li ul li:hover,.sidr ul li ul li.active,.sidr ul li ul li.sidr-class-active{background:#333;line-height:40px}
.sidr ul li ul li:hover>a,.sidr ul li ul li:hover>span,.sidr ul li ul li.active>a,.sidr ul li ul li.active>span,.sidr ul li ul li.sidr-class-active>a,.sidr ul li ul li.sidr-class-active>span{}
.sidr ul li ul li a,.sidr ul li ul li span{color:rgba(255,255,255,0.8);pa dding-left:30px}.sidr form{margin:0 15px}.sidr label{font-size:13px}.sidr input[type="text"],.sidr input[type="password"],.sidr input[type="date"],.sidr input[type="datetime"],.sidr input[type="email"],.sidr input[type="number"],.sidr input[type="search"],.sidr input[type="tel"],.sidr input[type="time"],.sidr input[type="url"],.sidr textarea,.sidr select{width:100%;font-size:13px;padding:10px;-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;margin:0 0 10px;-webkit-border-radius:2px;-moz-border-radius:2px;-ms-border-radius:2px;-o-border-radius:2px;border-radius:2px;border:none;background:r gba(0,0,0,0.1);color:rgba(255,255,2 55,0.6);display:block;clear:both}.s idr input[type=checkbox]{width:auto;display:inline;clear:no ne}.sidr input[type=button],.sidr input[type=submit]{color:#333;background:#fff}.sidr input[type=button]:hover,.sidr input[type=submit]:hover{background:rgba(255,255,255, 0.9)}
a.sidr-class-toggle-sidr-close {color:#fff; text-decoration:none; display:block; text-align:right; padding:10px 20px;}
a.sidr-class-toggle-sidr-close:before {font-size:20px; font-weight:bold; color: #fff; margin: 0; text-decoration:none; content:"x"; background:#222222; padding:2px 10px; border-radius:50% }
.sidr-class-current > a{ background:#222}
[/css]
-------------
mod-style
[css]
.pane-sliders .panel { border: none !important; }
div.panel > h3 { height: 30px!important;padding:0!important; background: #fff!important; border: 1px solid #ccc; -moz-border-radius: 3px; -webkit-border-radius: 3px; border-radius: 3px; font: bold 18px/30px Arial, Helvetica, sans-serif}
div.panel > h3 a { color: #333!important;}
div.panel h3.pane-toggler-down{ background:#D5EEFF!important;border : 1px solid #A4CDE9!important; width:100%; height:100%}
div.panel h3.pane-toggler-down a { color: #333!important; }
.sub-heading {background:#D5EEFF!important;borde r: 1px solid #A4CDE9!important; color:#333!important;min-width:400px; max-width:400px; -moz-border-radius: 3px; -webkit-border-radius: 3px; border-radius: 3px; font: bold 15px/30px Arial, Helvetica, sans-serif; display:block; padding:0 10px; margin:0 0 10px 0;text-align:left!important}
.description {-moz-border-radius: 3px; -webkit-border-radius: 3px; border-radius: 3px; font-weight:normal; border:1px solid #ccc; padding:10px; margin:0 0 10px 0; max-width:400px}
.sub-heading span {color:#777}
.pane-toggler span { padding: 10px 0 10px 10px !important;background: transparent!important; }
.pane-toggler-down span { padding: 10px 0 10px 10px !important;background: transparent!important; }
.pane-sliders .content { margin: 4px auto; width: 100%; -moz-border-radius: 3px; -webkit-border-radius: 3px; border-radius: 3px; }
.pane-down {border: 1px solid #ccc !important;}
.panel fieldset.panelform > ul > li > label { color: #444; font-size: 11px; font-weight: bold; height: 24px; line-height: 24px; padding: 0 20px 0 10px; text-align: right; max-width: 30%!important; min-width: 30%!important;}
.panel fieldset.panelform > ul > li fieldset { line-height:28px; }
fieldset.panelform input { height: 16px; color: #555; line-height: 16px; padding: 4px; border-radius: 2px; -moz-border-radius: 2px; -webkit-border-radius: 2px; width:250px; }
fieldset.panelform select { height: 26px; color: #555; line-height: 24px; padding: 4px; font-size:11px; border-radius: 2px; -moz-border-radius: 2px; -webkit-border-radius: 2px;width:150px; }
fieldset.panelform select[multiple=multiple] { height: auto!important}
fieldset.panelform textarea {border-radius: 2px; -moz-border-radius: 2px; -webkit-border-radius: 2px;width:250px;padding: 4px;}
.fltrt ul.adminformlist li { overflow: hidden; border-bottom: 1px solid #eee; padding: 1px 10px; margin: 0; }
.custom-tabs {background:#D5EEFF!important;borde r: 1px solid #A4CDE9!important; -moz-border-radius: 3px; -webkit-border-radius: 3px; border-radius: 3px; font-weight:bold; display:block; padding:0 10px}
label[id^="jform_params_"], label[id*="jform_params_"] {}
[/css]