Could you make a DIV that covers the ENTIRE surface of the page without leaving even 1px gap?

In the article on Dev.to, author Len Morld addresses a common issue faced by many developers: how to fill the page with a large div element. The author begins by discussing traditional methods to achieve this goal, which often involve setting the div's height to 100% of the viewport height; however, many of these methods can lead to unexpected results across different browsers. One example of such a problem is when an element doesn't fully cover the height, which can be frustrating during project work. Next, the author introduces more advanced techniques such as using Flexbox and CSS Grid, which allow for more flexible and responsive solutions. Implementing these techniques not only makes the developer's life easier but also enhances the quality of the UI created, which is crucial in modern web design. Finally, the article provides practical examples to help readers better understand the techniques described.