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zxx-grid zxx-item::before{
  content: "0" counter(section);
  font-weight: bold;
  font-size: 3rem;
  line-height: 1;
  position: absolute;
  right: 0px;
  bottom: 0px;
}

zxx-grid zxx-item{
  position: relative;
  counter-increment: section;
}