<div class="my-flex-table" style="display: flex;display: -webkit-flex;flex-wrap: wrap;-webkit-flex-wrap: wrap;width: 100%;">
    <div class="my-flex-cell" style="width: 33.333%;border: 1px solid #ddd;box-sizing: border-box;padding: 5px;">
        <div class="my-flex-cell-content">
            <img src="DEINE QUELLE" style="width: 100%!important;height: auto!important;" />
        </div>
    </div>
</div>