Navigation bars are created with the w3-bar class. Additional classes like w3-bar-item are used for links or buttons within the navigation bar.
<div class="w3-bar w3-light-grey">
<a href="#" class="w3-bar-item w3-button">Home</a>
<a href="#" class="w3-bar-item w3-button">About</a>
<a href="#" class="w3-bar-item w3-button">Contact</a>
</div>
<div class="w3-bar w3-light-grey">
<a href="#" class="w3-bar-item w3-button w3-blue">Home</a>
<a href="#" class="w3-bar-item w3-button">About</a>
<a href="#" class="w3-bar-item w3-button">Contact</a>
</div>
To make the navigation bar responsive, use the w3-hide-small or w3-hide-medium classes.
<div class="w3-bar w3-light-grey">
<a href="#" class="w3-bar-item w3-button w3-hide-small">Home</a>
<a href="#" class="w3-bar-item w3-button w3-hide-small">About</a>
<a href="#" class="w3-bar-item w3-button">Contact</a>
</div>