<link href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//netdna.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="container"> <div class="row"> <div class="col-md-6 col-md-offset-3"> <h1>Expandable Search Form</h1> </div> </div> <div class="row"> <div class="col-md-4 col-md-offset-3"> <form action="" class="search-form"> <div class="form-group has-feedback"> <label for="search" class="sr-only">Search</label> <input type="text" class="form-control" name="search" id="search" placeholder="search"> <span class="glyphicon glyphicon-search form-control-feedback"></span> </div> </form> </div> </div> </div>

.search-form .form-group { float: right !important; transition: all 0.35s, border-radius 0s; width: 32px; height: 32px; background-color: #fff; box-shadow: 0 1px 1px rgba(0, 0, 0, 0.075) inset; border-radius: 25px; border: 1px solid #ccc; } .search-form .form-group input.form-control { padding-right: 20px; border: 0 none; background: transparent; box-shadow: none; display:block; } .search-form .form-group input.form-control::-webkit-input-placeholder { display: none; } .search-form .form-group input.form-control:-moz-placeholder { /* Firefox 18- */ display: none; } .search-form .form-group input.form-control::-moz-placeholder { /* Firefox 19+ */ display: none; } .search-form .form-group input.form-control:-ms-input-placeholder { display: none; } .search-form .form-group:hover, .search-form .form-group.hover { width: 100%; border-radius: 4px 25px 25px 4px; } .search-form .form-group span.form-control-feedback { position: absolute; top: -1px; right: -2px; z-index: 2; display: block; width: 34px; height: 34px; line-height: 34px; text-align: center; color: #3596e0; left: initial; font-size: 14px; }