The simplest slider navigation bar

css:

ul li{
display: inline;
margin-right: 3em;
}
ul{
margin:8em auto;
margin-left: 20%;
}
ul li:hover{
border-bottom: 2px solid #000;
}

 

html:

<ul>
<li>loveyoumom</li>
<li>loveyoumom</li>
<li>loveyoumom</li>
<li>loveyoumom</li>
<li>loveyoumom</li>
</ul>

You may also be changed from the slider bar to navigate through the adjusting li padding-bottom / top.