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<html><head><style>div.ex1 { width: 300px; background-color: yellow;}div.ex2 { width: 300px; padding: 25px; background-color: lightblue;}</style></head><body><h2>Padding and element width</h2><div class="ex1">This div is 300px wide.</div><br><div class="ex2">The width of this div is 350px, even though it is defined as 300px in the CSS.</div></body></html>