<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="container"> <input type="text" class="search-query" placeholder="Search"> </div>

.search-query { -webkit-border-radius: 3px; -moz-border-radius: 3px; -webkit-transition: width 0.2s ease-in-out; -moz-transition:width 0.2s ease-in-out; -o-transition: width 0.2s ease-in-out; transition: width 0.2s ease-in-out; } .search-query:focus{ width: 260px; }