body {
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
    background-color: #61514E;
    margin: 0;
    padding: 20px
}

h1 {
    color: #333;
    font-size: 2.5em;
    margin-bottom: 20px
}

#grille {
    display: grid;
    /* grid-template-columns: repeat(4, 100px); */
    grid-gap: 10px;
    margin: 30px auto;
    max-width: 430px;
    justify-content: center;
}

.carte {
    height: 100px;
    background-color: #DB8270;
    border-radius: 5px;
    cursor: pointer;
    display: flex;
    align-items: center;
    font-size: 0;
    color: transparent;
    transition: all 0.3s ease;
}

.carte:hover {
    background-color: #34495e;
}

.carte.retournee {
    background-color: #5CDBAA;
    font-size:  40px;
    color: #f0f0f0;
}

.hidden {
    display: none;
}