DedeV6/src/theme/dedebiz/widget_search.htm

<div class="item-hot bg-white shadow-sm rounded p-3">
    <form class="search" name="formsearch" action="{dede:global.cfg_phpurl/}/search.php">
        <input type="hidden" name="kwtype" value="0">
        <div class="input-group">
            <input name="q" type="text" class="form-control" placeholder="请输入关键词">
            <div class="input-group-append"><button type="submit" id="validateimg" class="btn btn-success btn-sm"><i class="fa fa-search"></i></button></div>
        </div>
    </form>
</div>