Equel width menu tab code

<tab>
<link rel="stylesheet" href="http://www.w3schools.com/lib/w3.css" />
<div class="w3-btn-group">

<a href="http://adclub101.blogspot.in/p/contact-us.html"button class="w3-btn w3-teal" style="width:25% ; font-size:11px">HOME

<a href="#"button class="w3-btn w3-pink" style="width:25% ; font-size:11px">ABOUT US

<a href="#"button class="w3-btn w3-teal" style="width:25% ; font-size:11px">SERVICES

<a href="#"button class="w3-btn w3-pink" style="width:25% ; font-size:11px">CONTACT


</a></a></a></a></div></tab>