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<!DOCTYPE html> <html> <head> <style> * { box-sizing: border-box; } .flex-container { display: flex; flex-direction: row; font-size: 30px; text-align: center; } .flex-item-left { background-color: #f1f1f1; padding: 10px; flex: 50%; } .flex-item-right { background-color: dodgerblue; padding: 10px; flex: 50%; } /* Responsive layout - makes a one column-layout instead of two-column layout */ @media (max-width: 800px) { .flex-container { flex-direction: column; } } </style> </head> <body> <h1>Responisve Flexbox</h1> <p>The "flex-direction: row;" stacks the flex items horizontally (from left to right).</p> <p>The "flex-direction: column;" stacks the flex items vertically (from top to bottom).</p> <p><b>Resize the browser window to see that the direction changes when the screen size is 800px wide or smaller.</b></p> <div class="flex-container"> <div class="flex-item-left">1</div> <div class="flex-item-right">2</div> </div> </body> </html>