.zoomable {
  width: 400px;
  position: relative;
  float: left;
}

.zoomable img {
  width: 100%;
}

.focus-box {
  border: 1px solid purple;
  width: 100px;
  height: 100px;
  content: "";
  position: absolute;
  overflow: hidden;
  z-index: 1000;
}

.zoomed-image {
  float: left;
  position: relative;
  background-repeat: no-repeat;
}