QR Code Component Page with plain html and css

I would recommend you to seperate your styling by creating another file named styles.css

create a styles.css in your main folder and link your css inside your index.html by creating a link rel="stylesheet" href="styles.css" inside your head section under your meta

Its better for the overview because in larger projects it does not look well. In ordner to have tight codes with good structure it will give you a big advantage.