.p-0 {
  padding: 0;
}

.p-atom-1 {
  padding: .75rem;
}

.p-atom-2 {
  padding: 1rem;
}

.p-atom-3 {
  padding: 1.5rem;
}

.p-atom-4 {
  padding: 2rem;
}

.p-molecule-1 {
  padding: 2.5rem;
}

.p-molecule-2 {
  padding: 3rem;
}

.p-molecule-3 {
  padding: 4rem;
}

.py-molecule-4 {
  padding: 4.5rem;
}

.p-organism-1 {
  padding: 5.5rem;
}

.p-organism-2 {
  padding: 6rem;
}

.p-organism-3 {
  padding: 7.5rem;
}

.p-organism-4 {
  padding: 10rem;
}