<div class="container">
  <div class="service">1</div>
  <div class="service">2</div>
  <div class="service">3</div>
  <div class="service">4</div>
  <div class="service">5</div>
  <div class="service">6</div>
  <div class="service">7</div>
</div>
.container .service{
  border:1px solid red;
  margin:5px;
  padding:5px;
}
.container div:nth-child(n + 4){
  border:1px solid green;
  background-color:lightgreen;
}

External CSS

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External JavaScript

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