srcset

<div id="pg-334-2" class="panel-grid panel-has-style">
    <div style="padding: 0px 0; " data-overlay="true" data-overlay-color="#000000"
         class="panel-row-style panel-row-style-for-334-2">
        
        <div id="pgc-334-2-0" class="panel-grid-cell">
            <div id="panel-334-2-0-0" class="so-panel widget widget_media_image panel-first-child panel-last-child"
                 data-index="2">
                <div style="text-align: left;" data-title-color="#443f3f" data-headings-color="#443f3f"
                     class="panel-widget-style panel-widget-style-for-334-2-0-0"><img width="576" height="1024"
                                                                                      src="http://litta.co/wp-content/uploads/2015/03/Postcode-576x1024.jpg"
                                                                                      class="image wp-image-564  attachment-large size-large"
                                                                                      alt=""
                                                                                      style="max- 100%; height: auto;"
                                                                                      srcset="http://litta.co/wp-content/uploads/2015/03/Postcode-576x1024.jpg 576w, http://litta.co/wp-content/uploads/2015/03/Postcode-169x300.jpg 169w, http://litta.co/wp-content/uploads/2015/03/Postcode-230x409.jpg 230w, http://litta.co/wp-content/uploads/2015/03/Postcode-350x623.jpg 350w, http://litta.co/wp-content/uploads/2015/03/Postcode-480x854.jpg 480w, http://litta.co/wp-content/uploads/2015/03/Postcode.jpg 750w"
                                                                                      sizes="(max- 576px) 100vw, 576px"/>
                </div>
            </div>
        </div>

        <div id="pgc-334-2-1" class="panel-grid-cell">
            <div id="panel-334-2-1-0" class="so-panel widget widget_media_image panel-first-child panel-last-child"
                 data-index="3">
                <div style="text-align: left;" data-title-color="#443f3f" data-headings-color="#443f3f"
                     class="panel-widget-style panel-widget-style-for-334-2-1-0"><img width="576" height="1024"
                                                                                      src="http://litta.co/wp-content/uploads/2015/03/Skips-576x1024.jpg"
                                                                                      class="image wp-image-567  attachment-large size-large"
                                                                                      alt=""
                                                                                      style="max- 100%; height: auto;"
                                                                                      srcset="http://litta.co/wp-content/uploads/2015/03/Skips-576x1024.jpg 576w, http://litta.co/wp-content/uploads/2015/03/Skips-169x300.jpg 169w, http://litta.co/wp-content/uploads/2015/03/Skips-230x409.jpg 230w, http://litta.co/wp-content/uploads/2015/03/Skips-350x623.jpg 350w, http://litta.co/wp-content/uploads/2015/03/Skips-480x854.jpg 480w, http://litta.co/wp-content/uploads/2015/03/Skips.jpg 750w"
                                                                                      sizes="(max- 576px) 100vw, 576px"/>
                </div>
            </div>
        </div>

        <div id="pgc-334-2-2" class="panel-grid-cell">
            <div id="panel-334-2-2-0" class="so-panel widget widget_media_image panel-first-child panel-last-child"
                 data-index="4">
                <div style="text-align: left;" data-title-color="#443f3f" data-headings-color="#443f3f"
                     class="panel-widget-style panel-widget-style-for-334-2-2-0"><img width="584" height="1024"
                                                                                      src="http://litta.co/wp-content/uploads/2015/03/Basket-Skip-584x1024.jpg"
                                                                                      class="image wp-image-568  attachment-large size-large"
                                                                                      alt=""
                                                                                      style="max- 100%; height: auto;"
                                                                                      srcset="http://litta.co/wp-content/uploads/2015/03/Basket-Skip-584x1024.jpg 584w, http://litta.co/wp-content/uploads/2015/03/Basket-Skip-171x300.jpg 171w, http://litta.co/wp-content/uploads/2015/03/Basket-Skip-230x403.jpg 230w, http://litta.co/wp-content/uploads/2015/03/Basket-Skip-350x613.jpg 350w, http://litta.co/wp-content/uploads/2015/03/Basket-Skip-480x841.jpg 480w, http://litta.co/wp-content/uploads/2015/03/Basket-Skip.jpg 750w"
                                                                                      sizes="(max- 584px) 100vw, 584px"/>
                </div>
            </div>
        </div>

    </div>
</div>