<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Font Size Using Viewport Units</title> <style> body { font-size: 2vw; } h1 { font-size: 5vw; } </style> </head> <body> <h1>This is a Most important paragraph.</h1> <p>This also very important paragraph..</p> </body> </html>