*{
    margin: 0;
    padding: 0;
}
body{
    box-sizing: border-box;
    background-color: rgb(0, 0, 116);
}
.fill{
    background-image: url(myimage.jpg);
    background-size: cover;
    background-position: center;
    width: 150px;
    height: 150px;
    top: 5px;
    left: 5px;
    position: relative;
    cursor: pointer;
}
.drag-drop{
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin-top: 50px;
}
.empty{
    width: 160px;
    height: 160px;
    background-color: #002451;
    border: 2px solid #dddddd;
}
.hold{
    border: 4px solid #cccccc;
}
.invisible{
    display: none;
}
.hovered{
    background: #f4f4f4;
    border-style: dashed;
}