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<!doctype html>
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<title>Example</title>
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<style>
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  div {
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    background: gold;
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    padding: 20px;
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  }
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  p {
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    text-align: justify;
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    margin-right: 30vw;
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    font-size: 4vw;
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  }
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</style>
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<div>
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<p>This text has had its right margin set to <code>30vw</code>. The result is that the margin pushes it away from the right edge of its containing box by the value of the margin.</p>
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</div>