CodePen Embed - css-selector-double-class

<div class="foo">
  foo
</div>

<div class="bar">
  bar
</div>

<div class="foo bar">
  foo and bar
</div>

.foo.bar{
  background: green;
}

.foo{
  background: red;
  color: #fff;
}

.bar{
  background: yellow;
}

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