.facebook-feeds{
    -moz-box-sizing:border-box;
    -webkit-box-sizing:border-box;
    box-sizing:border-box;
    display:block;
    height:100%;
    margin:auto;
    max-height:500px;
    max-width:500px;
    padding-bottom:100%;
    position:relative;
    width:100%;
}
.facebook-feeds > iframe{
    height:100% !important;
    left:0;
    position:absolute;
    top:0;
    width:100% !important;
}