<form id="upload_csv" action="{$actionUrl}" method="post" enctype="multipart/form-data">
    <div class="row">
        <div class="col-md-4">
            <div class="input-group">
                <button type="submit" class="btn btn-primary">Import</button>
                <span class="input-group-wrap">
                <input class="form-control" type="file" name="csv_file" id="csv_file" accept=".csv" tabindex="1"/>
            </span>
            </div>
        </div>
    </div>
</form>

<a href="{$actionUrlDownload}" type="button" class="btn btn-primary export">Export</a>