html, body {
    margin:0;
}
.div1 {
    width: 100%;
    margin:0;
}
.div2 {
    margin:0 auto;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
}
img {
    margin:0;
    width:auto;
    max-width: 100%;
    border-left:1px solid #afafaf;
    border-right:1px solid #afafaf;
}