#json-fragebogen {
    max-width: 600px;
    margin: 30px auto;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 10px;
    text-align: center;
}

#json-fragebogen button {
    width: 100%;
    padding: 12px;
    margin: 8px 0;
    font-size: 16px;
    border: none;
    border-radius: 6px;
    background: #0073aa;
    color: #fff;
    cursor: pointer;
}

#json-fragebogen button:hover {
    background: #005177;
}

@media (min-width: 600px) {
    #json-fragebogen button {
        width: 48%;
        margin: 1%;
    }
}