Check out example codes for "how to make text bigger in html". It will help you in understanding the concepts better.

Code Example 1

<!DOCTYPE html>
   <html>    
      <head>      
         <title>HTMLFont size</title>    
      </head>    
      <body>      
         <h1 style="color:red;font-size:40px;">Heading</h1>      
         <p style="color:blue;font-size:18px;">This is demo text</p>    
      </body>
</html>

Code Example 2

p {
  font-size: 15px;
}

p {
  font-size: large;
}

p {
  font-size: 150%;
}

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