html - Applying a css style to several patterns -

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How can I apply a CSS style block to many different classes? For example, I have 

  & lt; Div class = "foo" & gt; ... & lt; / Div & gt; & Lt; Div class = "bar" & gt; ... & lt; / Div & gt; ... .foo .bar ??? // This selector should be applied to both classes (font size: 50%; ...}

.foo, .bar {font-size: 50%; ...}

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