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<p class="one">This is text.</p>
<p class="two">The width of div remains at 200px, in spite of the 25px of left and right padding, because of box-sizing: border-box.</p>.one {
background: yellow;
width: 200px;
}
.two {
background: lightblue;
width: 200px;
padding: 25px;
box-sizing: border-box;
}