body {
    padding-top: 5rem;
    font-family: Arial, Helvetica, sans-serif;
}

/* Basis: mobiles Gerät */
h1 {
    font-size: 16px;
    font-weight: bold;
    text-align: center;
}

h2 {
    font-size: 14px;
    text-align: left;
}

h3 {
    font-size: 12px;
    text-align: left;
}

body {
    font-size: 10px;
}

p {
    text-align: justify;
}

>

/* Ab Tablet */
@media (min-width: 768px) {
    h1 {
        font-size: 20px;
        text-align: center;
    }

    h2 {
        font-size: 18px;
        text-align: left;
    }

    h3 {
        font-size: 16px;
        text-align: left;
    }

    body {
        font-size: 14px;
    }
}

/* Ab großem Bildschirm */
@media (min-width: 1200px) {
    h1 {
        font-size: 26px;
        text-align: center;
    }

    h2 {
        font-size: 24px;
        text-align: left;
    }

    h3 {
        font-size: 22px;
        text-align: left;
    }

    body {
        font-size: 18px;
    }
}