style.css

.draggable-container,
.dropzone-container {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
}

.draggable {
    width: 50px;
    height: 50px;
}

.dropzone {
    width: 100px;
    height: 100px;
}

.draggable,
.dropzone {
    text-align: center;
    border: 2px solid #333;
    user-drag: none;
}

.draggable {
    background-color: lightblue;
    cursor: move;
}

.dropzone {
    background-color: lightgrey;
}