<div class="container">
  <p>Some text in exemple</p>
  <p>This is some text.</p>
  <ul>
    <li>1 element</li>
    <li>1 element</li>
    <li>1 element</li>
    <li>1 element</li>
    <li>1 element</li>
    <li>1 element</li>
  </ul>
</div>

.container{
  margin:0 auto;
  border: 1px solid #333;
  max-width: 500px;
}

p{
  font-weight:bold;
}
div p:nth-child(2){
  background: yellow;
}
li:nth-child(2){
  color: #3d3d;
}
li:nth-child(2n){
 background: lightyellow;
}
li:nth-child(-n + 3) {
  border: 2px solid orange;
  margin-bottom: 1px;
}