---

<div class="row">
            <div class="col-4"><img src="{{ url_for('static', filename=product.img1) }}" class="img-thumbnail" style="cursor:pointer" onclick="document.getElementById('mainImg').src=this.src"></div>
            <div class="col-4"><img src="{{ url_for('static', filename=product.img2) }}" class="img-thumbnail" style="cursor:pointer" onclick="document.getElementById('mainImg').src=this.src"></div>
            <div class="col-4"><img src="{{ url_for('static', filename=product.img3) }}" class="img-thumbnail" style="cursor:pointer" onclick="document.getElementById('mainImg').src=this.src"></div>
        </div>