body {
  background-color:black;
}

.centerblock {
  width:fit-content;
  position:absolute;
  top:10%;
  left:50%;
  transform:translateX(-50%);
  text-align:center;
}

#card {
  background-image:url(images/0.jpg);
  background-size:contain;
  background-repeat:no-repeat;
  width:400px;
  height:600px;
  border:none;
  background-color:black;
}


@media only screen and (max-width: 600px) {
  #card {width:100%;height:500px;}.centerblock{width:90%;}
}