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<html><head><meta name="viewport" content="width=device-width, initial-scale=1"><style>* { box-sizing: border-box;}.col-container { display: table; width: 100%;}.col { display: table-cell; padding: 16px;}@media only screen and (max-width: 600px) { .col { display: block; width: 100%; }}</style></head><body><h2>Responsive Equal Height Columns</h2><p>Resize the browser window to see the result. The columns will automatically stack on screens smaller than 600px.</p><div class="col-container"> <div class="col" style="background:orange"> <h2>Column 1</h2> <p>Hello World</p> </div> <div class="col" style="background:yellow"> <h2>Column 2</h2> <p>Hello World!</p> <p>Hello World!</p> <p>Hello World!</p> <p>Hello World!</p> </div>