.pierres-de-naissance {
    font-family: Arial, sans-serif;
    width: 95%;
    margin: 0 auto;
    padding: 20px;
    background-color: #f1f1f1;
    border-radius: 25px;
}

.pierres-de-naissance select {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    border: 1px solid #999;
    background-color: #fff;
    border-radius: 5px;
}

.pierres-de-naissance button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    text-align: center;
}

.pierres-de-naissance .resultat {
    font-size: 1.2em;
    font-weight: bold;
    margin-top: 20px;
    margin-bottom: 20px;
}

small {
    font-size: 1em;
}