.hauptbild{
    width: 300px;
    border-radius: 20px;
    transition:0.2s;
}

.fenster img:hover{
    transform:scale(1.1); 
}

.tabl_fenster{
    display: flex;
    justify-content:space-around;
    gap: 20px;
    margin-top: 40px;
    margin-bottom: 30px;
}

.merezi{
    display: flex;
    justify-content: center;
}
@media (max-width: 768px){

    .tabl_fenster{
        flex-direction: column;
        align-items: center;
        gap: 30px;

        margin-top: 20px;
        padding: 0 10px;
    }

    .hauptbild{
        width: 100%;
        max-width: 340px;
    }

    .fenster{
        width: 100%;
        text-align: center;
    }

    .fenster h2{
        margin-bottom: 12px;
    }

}