solid-badge{
  box-sizing: border-box;
  font-family: sans-serif;
  font-size: 13px;
}

solid-badge .counter{
  display: block;
  background-color: var(--solid-badge-theme, gray);
  border-radius: 50%;
  line-height: 25px;
  width: 25px;
  height: 25px;
  text-align: center;
  font-weight: bold;
}

solid-badge .counter[data-nb-unread="0"]{
  display: none;
}