style.css

h1 {
  text-align: center;
}
.column {
  float: left;
  width: 50%;
  padding: 10px;
}
.row:after {
  content: "";
  display: table;
  clear: both;
}
#input-image {
  max-height: 300px;
}
#label-image {
  height: 300px;
}
#result-image {
  height: 300px;
}
img#visitor-badge {
  display: block;
  margin: auto;
}