Respuesta :

tonb

Here is an HTML example with the CSS class defined inline:

<!doctype html>

<html>

 <head>

   <style>

  .YellowBackground {

 background-color : yellow;

  }

</style>

   

   </head>

 

   <body class="YellowBackground">

       <h1>A yellow background</h1>

   </body>

</html>

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