html,
body {
    margin: 0;
    padding: 0;
    background-color: #272727;
    color: #ffffff;
    box-sizing: border-box;
    font-size: 30px;
}

.titulo {
    text-align: center;
    background-color: black;
    color: #ffffff;
    padding: 20px;
    font-size: 25px;
}
.container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;

}
.panel{
    margin-top: 20px;
    display: grid;
    grid-template-columns: 75px 75px 75px 75px;
    border: 2px solid #f76707;
    border-radius: 5px;
}   
.cartas{
    height: 75px;
    background-color: rgb(90, 90, 90);
    border: 3px dashed white;
    text-align: center;
    line-height: 75px;
    border-radius: 5px;
    margin: 2px;

}
.seleccionado{
    font-size: 30px;
}
.volteado{
    font-size: 0;
}
.correcto{
    font-size: 30px;
    background-color: yellowgreen;
}