Untitled

<!DOCTYPE html>
<html>
<head>
	<title>Test</title>
</head>
<style type="">
body{
	margin: 0 auto;
	background-color: green;
}
.holder{
	display: flex;
    align-items: center;
   	justify-content: space-around;
}
.box{
	height: 150px;
	width: 150px;
	background-color: yellow;
	margin: 20px 0 20px 0;
}


</style>
<body>
<div class="main">

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

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

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

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


</div>
</body>
</html>