I am designing a website with the width of 1085px

now I am facing a problem every time on full width menu it works fine on Mozilla but when i use chrome and in opera the same menu's width is making it too large i am attaching a picture here of my menu you will notice that in firefox the width works fine but in chrome and opera it will increase the width i wanna know what i do wrong every time in full width menu how do i fix it please help me css code also added here

Problem of Menu Bar in different browsers
[img]http://i44.tinypic.com/oqxg07.jpg[/img]

Css code

nav{
text-align: center;
display:block;
margin:0 auto;
padding:0;

}
.menu_website {
padding:0;
width:1085px;
}
.menu_website ul {
display:inline-block;
width:100%;
background-color: #FE9711;
  background: -moz-linear-gradient(top, #FE9711 0%, #E17310 100%); 
  background: -webkit-linear-gradient(top, #FE9711 0%, #E17310 100%); 
  background: -ms-linear-gradient(top, #FE9711 0%, #E17310 100%); 
  background: linear-gradient(top, #FE9711 0%, #E17310 100%); 
}

.menu_website li{
list-style: none;
float: left;
position: relative;
height: 40px;

}

.menu_website>li{
background-color: #FE9711;
  background: -moz-linear-gradient(top, #FE9711 0%, #E17310 100%); 
  background: -webkit-linear-gradient(top, #FE9711 0%, #E17310 100%); 
  background: -ms-linear-gradient(top, #FE9711 0%, #E17310 100%); 
  background: linear-gradient(top, #FE9711 0%, #E17310 100%); 
border-left: 1px solid #ffa32b;
border-right: 1px solid #b05a0d;
-webkit-transition: all 0.2s ease-in-out;
-moz-transition: all 0.2s ease-in-out;
-o-transition: all 0.2s ease-in-out;
transition: all 0.2s ease-in-out; 
}

.menu_website li:first-child{
border-radius: 1px 0px 0px 1px;
border-left: none;
}

 .menu_website li:last-child{
border-radius: 0px 1px 1px 0px;
 border-right: none;
 }

.menu_website a{
display: block;
text-decoration: none;
color: white;
text-transform:uppercase;
padding: 0 25px;
font-family:Arial, Helvetica, sans-serif;
margin: 0;
position: relative;
font-size: 13px;
font-weight:bold;
line-height: 40px;
}


.menu_website li:hover{
-webkit-box-shadow: inset 0 0 10px #470000;
-moz-box-shadow: inset 0 0 10px #470000;
box-shadow: inset 0 0 10px #470000;
background-color: #3f3f3f;
background-image: -webkit-linear-gradient(#565656, #373737);
background-image: -moz-linear-gradient(#565656, #373737);
background-image: -o-linear-gradient(#565656, #373737);
background-image: linear-gradient(#565656, #373737);
color:#fe5956;

}

.menu_website li:hover span:after{
-webkit-transform: rotate(180deg);
-moz-transform: rotate(180deg);
transform: rotate(180deg);
}

ul.menu_website-hover{
visibility: hidden;
position: absolute;
top:100%;
opacity: 0;
height: 0;
margin-left:1px;
-webkit-transition: all 0.3s ease-in-out;
-moz-transition: all 0.3s ease-in-out;
-o-transition: all 0.3s ease-in-out;
transition: all 0.3s ease-in-out;
}

.menu_website li:hover .menu_website-hover{
visibility: visible;
height: 100%;
opacity: 1;
}

.menu_website-hover li{
height: 100%;
border-bottom: 1px solid #696969;
background-color: #2a2a2a;
border-left: none;
border-right: none;
}

.menu_website-hover li:hover{
background-image: -webkit-linear-gradient(#2a2a2a, #434343);
background-image: -moz-linear-gradient(#2a2a2a, #434343);
background-image: -o-linear-gradient(#2a2a2a, #434343);
background-image: linear-gradient(#2a2a2a, #434343);
box-shadow: none;
}

.menu_website-hover a{
color: white;
}

.menu_website a span:after{
content: "";
border-left: 3px solid transparent;
border-right: 3px solid transparent;
border-bottom: 3px solid white;
position: absolute;
top: 30px;
right: 35px;

-webkit-transition: all 0.2s ease-in-out;
-moz-transition: all 0.2s ease-in-out;
-o-transition: all 0.2s ease-in-out;
transition: all 0.2s ease-in-out; 
}

.menu_website-hover li:first-child, .menu_website-hover li:last-child{
border-radius: 0;
}

.menu_website a:after {
    background: rgba(255,255,255,.07);
    content: "";
    height: 20px;
    left: 0;
    position: absolute;
    width: 100%;
}

Without seeing the html along with it, preferrably in a working state, this may be difficult to pin point...

At a quick glance, you have a bunch of stuff absolutely positioned... could you be inadvertantly collapsing an element by removing it's content from the flow of the page?

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