body {
    font-family: Verdana;
    text-align: center;
}

.part {
    display: block;
    margin-bottom: 5px;
}

.container {
    text-align: left;
    display: inline-block;
    vertical-align: top;
    width: 30%;
    min-width: 400px;
    border: 1px solid #ddd;
    height: 250px;
    position: relative;
}

.drag {
    width: 50px;
    height: 50px;
    border: 1px solid black;
    background-color: #ffffc8;
    cursor: pointer;
    position: absolute;
}
        
.drag.selected {
    background-color: #b6f3b6;
}

.container:after {
    display: block;
    width: 100%;
    height: 100%;
    text-align: center;
    color: #999;
}

#c1:after {
    content: 'Multidraggable';
}
#c2:after {
    content: 'Multidraggable with clone';
}
#c3:after {
    content: 'Multidraggable with snap';
}

#c2 .ui-draggable-container {
    background-color: rgba(255, 0, 0, 0.5);
}

#c3 .ui-draggable-container {
    background-color: rgba(255, 0, 0, 0.5);
    opacity: 1;
    outline: 2px solid yellow;
}

pre {
    white-space: pre-wrap;
}