body {
    font-family: Arial, Verdana, sans-serif;
}

#piezas {
    display: flex;
    flex-wrap: wrap;
    
    margin: auto;
    justify-content: center;
    border: 1px solid black;
    vertical-align: top;
}

#puzzle {
    border: 1px solid black;
    width: 318px;
    height: 495px;
    display: flex;
    flex-wrap: wrap;
    margin: auto;
    padding: 5px;
}

.pieza {
    width: 80px;
    height: 80px;
    background-size: cover;
    margin: 10px;
    width: 25%;
}

.placeholder,.imgcorre {
    background-color: #F2F2F2;
    outline: 1px solid #333;
    width: 80px;
    height: 80px;
    transition: 1s;
    width: 25%;
    text-align: center;
}


.placeholder.hover {
    background-color: orange;
}

.placeholder .pieza {
    margin: 0;
    min-width: 90%;
}

#mensaje {
    color: black;
    text-align: center;
    display: none;
}

.ganaste {
    background-color: #B3D67C;
}

.ganaste #mensaje {
    display: block;
}

.ganaste .placeholder {
    outline: none;
}

.ganaste #piezas {
    display: none;
}