.container-start-webseiten img {
    display: block;
    margin: 50px auto;
    max-width: 80%;
    height: auto;
    /* border-radius: 40px;
    box-shadow: 0px 0px 60px rgba(59, 111, 255, 0.5); */
}

@media (max-width: 768px) {
    .container-start-webseiten img {
        max-width: 90%;
        margin: 30px auto;
    }
}