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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<ul class="parent">
  <li class="item"></li>
  <li class="item"></li>
  <li class="item"></li>
  
  <li class="item"></li>
  <li class="item"></li>
  <li class="item"></li>
  
  <li class="item"></li>
  <li class="item"></li>
  <li class="item"></li>
</ul>
</body>
</html>
 
.parent {
  border: 1px solid black;
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
  width: 130px;
}
.item {
  width: 40px;
  height: 40px;
  background: #000;
  margin-right: 5px;
}
.item:nth-of-type(3n) {
  margin-right: 0;
  margin-bottom: 4px;
}
.item:last-of-type {
  margin-bottom: 0;
}
Output 300px

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