CodePen Embed - justify-content: center;

<div class="container">
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
  <div class="box"></div>
</div>

.container{
  display: flex;
  justify-content: center;
  background: #ccc;
  flex-wrap: wrap;
}

.box{
  width: 200px;
  height: 200px;
  margin: 10px;
  background-color: #66b6d5;
}

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