.responsive {
  width:95%;
  max-width:500px;
  max-height:50%;
}
.responsive2 {
  max-width:80%;
  max-height:80%;
}

.center {
  position: absolute;
  top: 58%;
  left: 50%; 
  transform: translate(-50%, -50%);
}

.center2 {
  position: absolute;
  top: 10%;
  left: 50%; 
  transform: translate(-50%, -50%);
}