body {
  background-color: #88bef5;
  background-image: url("/isthis pngs/3ciD9-slow.gif");
  background-attachment: scroll;
  background-size: cover;
  opacity: 0.9;
}
div {
  background-color: rgba(2, 15, 39, 0.75);
  float: right;
  width: 50%;
  padding: 40px;
  margin: 475px 425px 0px;
  border-radius: 25px;
  box-shadow: 5px 5px 15px;
  text-align: center;
}
p {
  width: 100%;
  margin: auto;
  text-align: center;
}
img {
  margin: auto;
  
}

https://i.imgur.com/3ciD9.gif
https://78.media.tumblr.com/15f2cf74f396b95b2fc7788ed744b10f/tumblr_pd1njbn8BB1rqnly5_540.gif