* {box-sizing: border-box;}

.img-magnifier-container {
  position: relative;
}
.img-magnifier-container img{ width: 100%; min-height:250px; /*max-height: 500px;*/ }

.img-magnifier-glass {
  position: absolute;
  border: 3px solid #000;
  border-radius: 50%;
  cursor: none;
  /*Set the size of the magnifier glass:*/
  width: 200px;
  height: 200px;
}