.ck-content p.padding-sm span {
  padding: 8px;
  border-radius: 4px;
  display: block;
}

.ck-content p.padding-md span {
  padding: 12px;
  border-radius: 4px;
  display: block;
}

.ck-content p.padding-lg span {
  padding: 16px;
  border-radius: 4px;
  display: block;
}