body {
    margin: 0;
    display: flex;
    justify-content: center;
}

picture.added img {
    border: 1px solid #3a5aff;
    border-radius: 5px;
}

div.log {
    position: fixed;
    border-radius: 5px;
    border: 1px solid #3a5aff;
    margin: 10px;
    padding: 10px;
    left: 0;
    bottom: 0;
}

@media screen and (min-width: 700px) {
    div.container {
        width: 700px;
    }
}
@media screen and (max-width: 700px) {
    div.container {
        width: 400px;
    }
}