Currently, I am trying to create a website for scratch for the first time but I am having difficulties linking my 4 different product pages together by one button (1,2,3,4). I just don't know which way to actually do it. I will insert the code below: thanks in advance.

/*-----------All Products-----------*/

.row-2 {
  justify-content: space-between;
  margin: 100px auto 50px;
}
select {
  border: 1px solid lightblue;
  padding: 5px;
}
select:focus {
  outline: none;
}
.page-btn {
  margin: 0 auto 20px;
}
.page-btn span {
  display: inline-block;
  border: 1px solid lightblue;
  margin-left: 10px;
  width: 40px;
  height: 40px;
  text-align: center;
  line-height: 40px;
  cursor: pointer;
}
.page-btn span:hover {
  background: lightblue;
  color: white;
}