​x
 
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<!DOCTYPE html>
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<title>Example</title>
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<style>
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    .big.colorful {
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        font-size: 2em;
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        color: yellowgreen;
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    }
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</style>
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​
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<blockquote class="big colorful">Price is what you pay. Value is what you get.</blockquote>
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​
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<p>The above blockquote is styled, because it has both classes (each separated by a whitespace) required to match the CSS selector.</p>
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<p>Change or remove one of the classes and you'll see that the CSS is no longer applied.</p>