<div>
  <div>This element isn't counted.</div>
  <p>1st paragraph.</p>
  <p>2nd paragraph.</p>
  <div>This element isn't counted.</div>
  <p>3rd paragraph.</p>
  <p>4th paragraph.</p>
</div>

body{
  background: #1f1f1f;
  width: 80%;
  border: 1px dashed #ffffff;
  margin: auto;
  padding: 50px;
  color: #ffffff;
}

/* nth-last-of-type selector */

  /* Odd paragraphs */
  p:nth-last-of-type(2n+1) {
    color: skyblue;
  }
  
  /* Even paragraphs */
  p:nth-last-of-type(2n) {
    color: orange;
  }