.group {
  display: inline-block;
}
.category {
  border: 1px solid;
  display: inline-block;
  text-align: center;
  padding: 5px;
  margin-bottom: 10px;
}
.level {
  max-width: calc(33% - 15px);
}
.output {
  max-width: calc(50% - 15px);
}
canvas { max-width: 100%; }
#visualize-process {
  text-align: center;
}