tabs {
  counter-reset: tab-counter;
}

/* Automatically increment tab numbers for each .tab-content inside a tab */
tab .tab-content::before {
  counter-increment: tab-counter;
  content: counter(tab-counter) "";

position: absolute;
  top: 5px;
  right: 1px;
  padding: 0px 4px;
  border-radius: 7px;

opacity: 0.7;
  font-weight: bold;
  font-size: 80%;
}