If you want to place a border around an entire Web page, you can use the CSS border tag. CSS, which stands for cascading style sheets, is the styling markup language supported by all Web browsers ...

Key Takeaways Start with basic concepts like selectors, properties, and box model before moving to layouts.Use online tools ...

Your actual CSS classes will probably define other attributes such as font-family, border-style, margin or width. Override them using the same technique you used to make the DIV's background color ...