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              <div class=" one two three ">
  <p>Using the attribute selector on the class attribute, you have to specify the exact string of classes (including spaces), not just one of them.</p>
              body {
  padding: 20px;
  text-align: center;

/* doesn't work */
[class='one'] {
  border: solid 1px red;

/* doesn't work */
[class='one two three'] {
  text-align: left;

/* this works */
[class=' one two three '] {
  background: gold;
  padding: 10px;
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