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<html><title>W3.CSS</title><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="https://www.w3schools.com/w3css/5/w3.css"><body><div class="w3-flex"> <div class="w3-padding w3-green"><h3>1</h3></div> <div class="w3-padding w3-green"><h3>2</h3></div> <div class="w3-padding w3-green" style="flex-basis:200px"><h3>3</h3></div> <div class="w3-padding w3-green"><h3>3</h3></div></div></body></html>