#nav {
background-color: #888888;
}
#nav h3 {
margin-left: 3em;
}
#nav-right {
display: table-cell;
}
.btn {
height: 100%;
}
<div class="fluid-container">
<div class="row navbar-fixed-top" id="nav">
<div class="col-lg-6" id="nav-left">
<h3>Tiago Fuelber's Portfolio</h3>
</div>
<div class="col-lg-3 col-lg-offset-2" id="nav-right">
<button type="button" class="btn btn-default">ABOUT</button>
<button type="button" class="btn btn-default">PORTFOLIO</button>
<button type="button" class="btn btn-default">CONTACT</button>
</div>
</div>
</div>