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<html><head><style>.flex-container { display: flex; align-items: stretch; background-color: #f1f1f1;}.flex-container > div { background-color: DodgerBlue; color: white; width: 100px; margin: 10px; text-align: center; line-height: 75px; font-size: 30px;}</style></head><body><h1>The flex-basis Property</h1><p>Set the initial length of the third flex item to 200 pixels:</p><div class="flex-container"> <div>1</div> <div>2</div> <div style="flex-basis:200px">3</div> <div>4</div></div></body></html>