<div class="col-lg-12 text-center mt-5">
  <h1>Bootstrap - Search Box Plugin</h1>
</div>
<div class="col-md-4 offset-md-4 mt-5 border border-success pt-3">
<div class="input-group mb-3">
  <input type="text" class="form-control" placeholder="Search ......" aria-label="Recipient's username">
  <div class="input-group-append">
    <span class="input-group-text"><i class="fa fa-search"></i></span>
  </div>
  </div>
</div>