body{
    background-color:lightblue;
    display:flex;
    flex-direction: column;
    align-items: center;
    margin-top:20px;
    font-family: 'Courier New', Courier, monospace;
}

.contenedor{
    display:flex;
    gap:40px;
}

.panel{
    display:grid;
    grid-template-columns: repeat(3,100px);
    grid-template-rows: repeat(3,100px);
    gap: 0.1px;
    margin:20px 0;
    border:1px solid gray;
}

.pieza{
    width: 100px;
    height:100px;
    cursor:grab;
}

.dropzone{
    width: 100px;
    height:100px;
    border: 2px dashed #aaa;
}

.mensaje{
    font-size:15px;
    color: green;
    display:none;
}