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

main {
    width: 1000px;
    border-color: lightgray;
    border-style: solid;
    border-width: 1px;
    margin: 30px 0 0 0;
    padding: 0 15px;
}

iframe {
    width: 1px;
    min-width: 100%;
}