body {
  margin: 0 auto;
  background-image: url("https://i.imgur.com/TdJh1g2.jpg");
  background-size: cover;
  opacity: 0.7;
}


.container {
  height: 70%;
  width: 50%;
  margin: 50px auto;
  padding: 20px;
  opacity: 0.7;
  text-align: center;
}