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code

// Add Shortcode
function custom_shortcode( $atts , $content = null ) {

	 <!DOCTYPE html>
	<html>
	<head>
	<style>
	.cities {
	  background-color: black;
	  color: white;
	  margin: 20px;
	  padding: 20px;
	}
	</style>
	</head>
	<body>
	
	<div class="cities">
	  <h2>London</h2>
	  <p>London is the capital of England.</p>
	</div>
	
	<div class="cities">
	  <h2>Paris</h2>
	  <p>Paris is the capital of France.</p>
	</div>
	
	<div class="cities">
	  <h2>Tokyo</h2>
	  <p>Tokyo is the capital of Japan.</p>
	</div>
	
	</body>
	</html> 

}
add_shortcode( 'Prueba', 'custom_shortcode' );