Top menu size

Good morning,

If you look at this http://img59.imageshack.us/i/sssssssj.jpg/ It´s a screenshot I took.

Like you can see my size of the page is 994 but I want to be 998 but when I move the bar the next step it offers me is 1003. For the rest of the sub menus it works but not for the main page.

Dou you guys have any solutions for this problem? Maybe directly adabting it in the html or somewhere else?

Thanks already :)

div.sys_top_menu {
min-height: 31px;
position: relative;
z-index: 99;
margin:-55px auto 0 auto;
width: 998px;
-webkit-border-top-left-radius: 5px;
-webkit-border-top-right-radius: 5px;
-khtml-border-top-left-radius: 5px;
-khtml-border-top-right-radius: 5px;
-moz-border-radius-topleft: 5px;
-moz-border-radius-topright: 5px;
border-top-left-radius: 5px;
border-top-right-radius: 5px;
}

like you can see the width is in a 998 standart like it should be but the index Hompage goes with 994 :/

what is the location of that file?

if its ..templates/base/css/top_menu.css   then the values at my file areas given. even i tried to see the raw file from downloaded zip file  , its same.

div.sys_top_menu {
min-height: 31px;

position: relative;
z-index: 100;

background: transparent url(../images/tm_bg.png) repeat-x scroll center top;
}
div.sys_top_menu a,
div.sys_top_menu a:link,
div.sys_top_menu a:visited,
div.sys_top_menu a:active,
div.sys_top_menu b {
font-size: 12px;
}

any help here?