3-6 xotpl/search.tpl

<form action="/search.php">
    <div class="input-group my-4">
        <input type="text" name="query" class="form-control" placeholder="請輸入關鍵字">
        <div class="input-group-append">
            <input type="hidden" name="action" value="results">
            <button type="submit" class="btn btn-primary"><i class="fa fa-search"
                    aria-hidden="true"></i></button>
        </div>
    </div>
</form>