DedeV6/src/theme/dedebiz/widget_qrcode.htm

<div class="card ddcard py-3">
    <div class="card-header">
        <div class="row">
            <div class="col-md-12 caption"><span>二维码</span></div>
        </div>
    </div>
    <div>{dede:qrcode/}</div>
</div>