<form method="GET" action="/search">
<div class="input-group">
<input
class="form-control"
name="s"
placeholder="Search..."
value="{{ search is defined ? search : '' }}"
/>
<div class="input-group-append">
<button
class="btn btn-secondary"
aria-label="Search"
><i class="fa fa-search"></i></button>
</div>
</div>
</form>