CodePen Embed - MWEjyOg

<p class="one">Hello World!</p>
<p class="two">Hello World!</p>

p.one {
  /*có box-sizing */
  padding: 50px;
  border: 1px solid red;
  width: 400px;
  box-sizing: border-box;
}

p.two {
  /* không có box-sizing */
  padding: 50px;
  border: 1px solid red;
  width: 400px;
}

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