drag and drop with alpha

HTML

<div id="dragme"><img src="https://www142.lunapic.com/editor/premade/transparent.gif" ></div>
    <div id="background"><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/9/93/Royal_Albert_Hall%2C_London_-_Nov_2012.jpg/800px-Royal_Albert_Hall%2C_London_-_Nov_2012.jpg" ></div>

CSS

#dragme {
    width: 300px;
    height: 300px;
    overflow: hidden;
    border: 2px blue solid;
    position: absolute;
    opacity:1;
}

JavaScript

$(function() {
   $( "#dragme" ).draggable();
});