.relatedproducts {
  border:1px solid #bdbdbd;
  background-color: rgb(var(--color-background));
  color: rgba(var(--color-foreground));
  border-radius: 5px;
  display: inline-block;
  margin: 5px;
  padding: 10px;
  font-size: 18px;
  letter-spacing: 0.1rem;
  line-height: 1;
  text-align: center;
  transition: border var(--duration-short) ease;
  cursor: pointer;
  position: relative;
   text-decoration: none;
}

.relatedproducts.checked {
  background-color: #000;
  color: #fff;
}