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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Example of CSS3 flex Property</title> <style> .flex-container { width: 300px; height: 200px; font-size: 32px; border: 1px solid black; display: -webkit-flex; /* Safari */ display: flex; /* Standard syntax */ } .flex-container div { -webkit-flex: 1; /* Safari */ -ms-flex: 1; /* IE 10 */ flex: 1; /* Standard syntax */ } .item1 { background: #e84d51; } .item2 { background: #7ed636; } .item3 { background: #2f97ff; } </style> </head> <body> <div class="flex-container"> <div class="item1">1</div> <div class="item2">2</div> <div class="item3">3</div> </div> </body> </html>