video{transform:translate(-50%);top:50%;left:50%}.content{position:static;bottom:0;background:rgba(0,0,0,.5);color:#f1f1f1;width:100%;padding:10px}#myBtn{width:200px;font-size:18px;padding:10px;border:none;background:#000;color:#fff;cursor:pointer}#myBtn:hover{background:#ddd;color:#000}.about_projext{padding:70px}.form_padding{padding:20px}