navigation bar entire width spaced items evenly - css

Question

I'm a bit new to css. I'm trying to make a horizontal navigation bar with only 3 text items for mobile device viewing. I have width set to 100% and each section width set to 32% (I tried 33% but it would place the 3rd item on a new line.) It looks ok as it is, but when I hover (or click on using a mobile device) the background color changes and you can see the margins.
ul.nav {
width:100%;
margin:0 auto;
padding:0;
list-style:none;
display:inline-block;
background-color:#62564A;
text-align:center;
font-family: sans-serif;
}
.nav li {
display:inline;
}
.nav a {
width:33%;
text-align:center;
display:inline-block;
padding-bottom:13px;
padding-top:12px;
border-left: 1px solid #fff;
border-right: 1px solid #fff;
}
.nav a:hover {
background:#A26A42;
border:none;
width:32%
}
ul.nav li:first-child a{
border:none;
}
ul.nav li:last-child a {
border:none;
}
End of CSS
<ul class="nav">
<li>Search</li>
<li>Legend</li>
<li>Info</li>
</ul>
<div id="map_canvas" style="position:absolute;left:0;right:0;"></div>
Thank you for any help.

Answer 1

I'd rework your CSS like this jsFiddle example.
CSS
ul.nav {
width:100%;
margin:0 auto;
padding:0;
list-style:none;
background-color:#62564A;
text-align:center;
font-family: sans-serif;
}
.nav li {
display:inline-block;
width:33%;
margin:0;
padding:0;
}
.nav a {
text-align:center;
padding:12px 0 13px 0;
margin:0;
border-left: 1px solid #fff;
border-right: 1px solid #fff;
display:block;
}
.nav a:hover {
background:#A26A42;
border:none;
}
ul.nav li:first-child a{
border:none;
}
ul.nav li:last-child a {
border:none;
}​

Answer 2

Try this:
* { margin:0; padding:0; } // This reset should go at the top of your CSS (if you don't have one already)
.nav li {
display:block;
float:left;
width: 33%;
}
.nav li a {
display:block;
text-align: center;
}
Fiddle: http://jsfiddle.net/kboucher/duaa6/

Answer 3

On "hover" you make the menu items narrower than normal. Plus you remove ther border which will narrow it even more. Also, It looks like you are using a 1px border left and right for spacing. If this is the case use margin instead. Use jsfiddle to practice.
Try this:
ul.nav {
width:100%;
margin:0;
padding:0;
list-style:none;
text-align:center;
font-family: sans-serif;
}
.nav li {
display:inline;
}
.nav a {
width:32%;
text-align:center;
display:inline-block;
padding-bottom:13px;
padding-top:12px;
margin-left: 1px;
background: #62564A;
}
.nav a:hover {
background:#A26A42;
}
ul.nav li:first-child a{
margin-left: 0;
}
http://jsfiddle.net/mVv75/4/