Try it Editor: The flex-basis Property

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<!DOCTYPE html>
<html>
<head>
<style>
#main {
    width: 300px;
    height: 100px;
    border: 1px solid #c3c3c3;
    display: -webkit-flex; /* Safari */
    display: flex;
}

#main div {
    -webkit-flex-grow: 0; /* Safari 6.1+ */
    -webkit-flex-shrink: 0; /* Safari 6.1+ */
    -webkit-flex-basis: 50px; /* Safari 6.1+ */
    flex-grow: 0;
    flex-shrink: 0;
    flex-basis: 50px;
}

#main div:nth-of-type(2) {
    -webkit-flex-basis: 100px; /* Safari 6.1+ */
    flex-basis: 100px;
}
</style>
</head>
<body>
<h1>The flex-basis Property</h1>

<p>Set the initial length of the flex items to 50 pixels, with an exception; set the initial length of the second flex item to 100 pixels:</p>
<div id="main">
  <div style="background-color:coral;">50px</div>
  <div style="background-color:lightblue;">100px</div>
  <div style="background-color:khaki;">50px</div>
  <div style="background-color:pink;">50px</div>
  <div style="background-color:lightgrey;">50px</div>
</div>

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

</body>
</html>
Result :