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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-panel w3-padding-small w3-blue">The w3-padding-small class adds 4px top and bottom and 8px left and right.</div><div class="w3-panel w3-padding w3-blue">The w3-padding class adds 8px top and bottom and 16px left and right.</div><div class="w3-panel w3-padding-large w3-blue">The w3-padding-large class adds 12px top and bottom and 24px left and right.</div></body></html>