.abschnitt {
    width: 60%;
    margin: 20px auto;
    box-shadow: 0 0 30px #000;
    background-color: #B42332;
}
@media only screen and (max-width: 1100px) {
  .abschnitt {
    width: 80%;
    margin: 10px auto;
}
}
@media only screen and (max-width: 640px) {
  .abschnitt {
    width: 90%;
    margin: 0 auto;
}
}