Add a separator between buttons in a menu bar (HTML/CSS) - css

Question

I'm making a mobile website and having some difficulty with making a few changes to my menu bar. I'm not an expert on this field so your help would be greatly appreciated.
Below is the codes to the menu bar.
CSS
<style type="text/css">
* { padding: 0; margin: 3; }
body { padding: 5px; font-family: Helvetica, Arial, sans-serif; width:95%; font-size:12px}
ul { list-style: none; }
ul li {
float: left;
padding: 1.5px;
position: relative;
margin: auto;}
ul a { display: table-cell; vertical-align: middle; width: 75%; height: 50px; text-align:center; background: #FFF; color:#000; border-style: solid; border-width:2px; border-color:#1570a6; text-decoration: none; }
ul a:hover {background-color:#5A87B4; }
HTML
<div>
<ul>
<li>
<div align="center"><a href="../Software.html" >Software</a>
</div>
</li>
<li>
<div align="center">Products</div>
</li>
<li>
FAQ</li>
</ul>
This is a basic menu bar and i want to adjust this to the center and also have horozontal lines to break each button apart while all this is centered and fits a 100% on a mobile screen. All your help is greatly appreciated
EDIT: Its like having some space after each button but instead theres a horizontal line
EDIT: Changed the width from 75% to 80px. Note that i also changed the div ID of my code because i was having some other problems with identification. :) Hope this wont confuse you
#menubar * { padding: 0; margin: 2; }
body { padding: 5px; font-family: Helvetica, Arial, sans-serif; width:95%; font-size:12px}
#menubar ul{text-align:center;}
#menubar ul li { display:inline-block; padding: 2px; position: relative; }
#menubar ul a { display: table-cell; vertical-align: middle; width: 80px; height: 50px; text-align:center; background: #FFF; color:#000; border-style: solid; border-width:2px; border-color:#1570a6; text-decoration: none; }

Answer 1

I added below lines in your css code. I hope this is what you want.
ul{
display:inline-block;
overflow:hidden;
}
div{
text-align:center;
}
li:after{
border-right:50px solid black;
content:"";
position:relative;
left:10px;
top:-27px;
z-index:-1;
display:block;
height:1px;
}
li:last-child{
margin-right:-14px
}
Working Fiddle

Answer 2

Now just remove float:left in your li and add display:inline-block; and add text-align center in your ul tag
as like this
ul{
text-align:center;
}
ul li{
display:inline-block;
vertical-align:top;
float:left; // remove this line
}
Demo

Answer 3

from your current css remove float:left; on li's and add text-align:center; and it should work:
ul li {
text-align: center;
padding: 1.5px;
position: relative;
margin: auto;
}
here is a working JSFiddle.
Update
In that case you can change the CSS to.
ul li{
text-align:center;
display:inline-block;
}
ul li:before {
content: " - ";
}
ul li:first-child:before {
content: none;
}
Here is a working JSFiddle