Try it Editor: The flex-wrap Property

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<!DOCTYPE html>
<html>
<head>
<style> 
#main {
    width: 200px;
    height: 200px;
    border: 1px solid #c3c3c3;
    display: -webkit-flex; /* Safari */
    -webkit-flex-wrap: wrap; /* Safari 6.1+ */
    display: flex;
    flex-wrap: wrap;
}

#main div {
    width: 50px;
    height: 50px;
}
</style>
</head>
<body>
<h1>The flex-wrap Property</h1>

<div id="main">
  <div style="background-color:coral;">A</div>
  <div style="background-color:lightblue;">B</div>
  <div style="background-color:khaki;">C</div>
  <div style="background-color:pink;">D</div>
  <div style="background-color:lightgrey;">E</div>
  <div style="background-color:lightgreen;">F</div>
</div>

<p><b>Note:</b> Internet Explorer 10 and earlier versions do not support the flex-wrap property.</p>
<p><b>Note:</b> Safari 6.1 (and newer) supports an alternative, the -webkit-flex-wrap property.</p>

</body>
</html>
Result :