#drop-zone {
    align-items: center;
    border: 1px solid #DDD;
    color: #CCC;
    display: flex;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 2em;
    font-weight: bold;
    height: 200px;
    justify-content: center;
    right: 0;
    top: 100px;
    width: 200px;
}

#red-square {
    background-color: red;
    box-sizing: border-box;
    height: 100px;
    width: 100px;
}

.is-being-dragged {
    opacity: 0.5;
    border: 8px dashed white;
}

.is-active-drop-zone {
    background-color: blue;
}

.box {
    border: 2px solid gray;
    height: 50px;
    width: 50px;
    margin: 5px;
}