Run Example

Edit This Code:
<!DOCTYPE html>
<html>
 <head>
  <title> Page Title </title>
  <style type="text/css">
   h1 {
    background-color: red;
   }
   h2 {
    background-color: #0000FF;
   }
   h3 {
    background-color: rgb(255, 99, 71);
   } 
  </style>
 </head>

 <body>
   <h1>This is first heading</h1>
   <h2>This is second heading</h2>
   <h3>This is third heading</h3>
 </body>
</html>
Result: