Draggable and a scrollbar

HTML

<div id="outer">
<div id="container">
    <div class="draggable">This</div>
    </div>
</div>
</div>

CSS

#container {
    margin: 30px;
    position: relative;
    width: 100px;
    height: 200px;
    overflow: auto;
    border: solid 1px lightgrey;
}
#outer {
     margin: 30px;
    position: relative;
    width: 400px;
    height: 300px;
    border: solid 1px red;
    
}
.draggable {
    position: absolute;
    top: 70px;
    left: 80px;
    background-color: gray;
    border: solid 1px red;
}

JavaScript

$('.draggable').draggable({
    scrollSpeed: 5
});