<form role="search" method="get" action="{{ site.url|esc_url }}" class="mb-4">
<div class="input-group">
<input type="search" class="form-control" name="s"
placeholder="{{ __('Search...') }}"
value="{{ search_query is defined ? search_query : '' }}"
aria-label="{{ __('Search') }}">
<button class="btn btn-primary" type="submit">
{{ __('Search') }}
</button>
</div>
</form>