.container {

    position: relative;

    padding-bottom: 56.25%;

    height: 0;

    overflow: hidden;

}

.container iframe {

    position: absolute;

    top:0;

    left: 0;

    width: 100%;

    height: 100%;
}
    .btn-whatsapp {
       display:block;
       width:px;
       height:-100px;
       color:#fff;
       position: fixed;
       right:20px;
       bottom:20px;
       border-radius:50%;
       line-height:10px;
       text-align:center;
       z-index:10;
}

.body{margin:0px; padding-top: 0px; background:#000000 url("") no-repeat center top;}