title: What do curly braces mean in JSX (React)?
body: <p>For an example, to set a style in react you could do</p>
  
  <p><code>var css = {color: red}</code></p>
  
  <p>and </p>
  
  <p><code>&lt;h1 style={css}&gt;Hello world&lt;/h1&gt;</code></p>
  
  <p>Why do you need the curly braces around css in the second code snippet?</p>