.facebook-wrapper {
    max-width: 500px;
    margin: 0 auto;
}
.facebook-wrapper > .fb-page {
    width: 100%;
}
.facebook-wrapper > .fb-page > span,
.facebook-wrapper iframe {
    width: 100% !important;
}

.facebook-wrapper2 {
    max-width: 500px;
    margin: 0 auto;
}
.facebook-wrapper2 > .fb-page {
    width: 100%;
}
.facebook-wrapper2 > .fb-page > span,
.facebook-wrapper2 iframe {
    width: 100% !important;
}