Live Demo - CSS3 Flex Grow

Source Code

<!DOCTYPE html>
   <html lang="en">
     <head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>CSS Flex </title>
     <style>       
     .flex-container {
       display: flex;
       flex-direction:row;
       background-color:lightgray;
       height:120px;
        }
       
     .flex-item{
       background-color:orange;
        color:white;
        text-align:center;
        height:80px;
        width:80px;
        line-height:80px;
        margin:10px;
        padding:10px;
      }
      .bg-info{
        background-color:#17A2B8;
      }
      
      .bg-primary{
        background-color:#007BFF;
      }
      
      .bg-warning{
        background-color:#FFC107;
      }
     </style>
</head>
<body>  
       <h1>The flex-grow Property</h1>
      <div class="flex-container">
        <div class="flex-item bg-info" style="flex-grow: 1">1</div>
        <div class="flex-item bg-primary" style="flex-grow: 2">2</div>
        <div class="flex-item bg-warning" style="flex-grow: 4">3</div>
      </div>
</body>
</html>
Source Code

Source Code Output :Running
