#app {
    width:800px;
    height:500px;
    background-color:rgba(0,0,0,0.2);
    border-radius:5px;
}

.draggable {
    width:200px;
    height:200px;
    background-color:#0078d7;
    border-radius:10px;
    position:absolute;
}

.head {
    width:90%;
    height:30px;
    margin: 0 auto;
    margin-top:10px;
    border-radius:5px;
    background-color:rgba(0,0,0,0.2);
}