Grid-based layouts in web design were originally created within HTML using table syntax. While it is possible for HTML-based tables to stretch and contract along with the width of the browser window itself, tables often lack some important functionality that UX design is steadily making more use of nowadays. Over time, these features were made possible by using CSS syntax instead, but the most useful way to have CSS create scalable grid-based layouts for web pages and user interfaces was only recently implemented as a module for CSS named CSS Grid. Many positioning concerns are alleviated by its functional simplicity, and other painstaking elements such as strategically using float elements are no longer necessary for the web designer to approach on his or her own.
CSS Grid syntax is best created within a utility that lets the user visually arrange a layout in terms of how the user wants the layout to appear at the end of a project. A recent interactive addition to a website named layoutit.com lets users freely create and adjust templates for CSS Grid-driven layouts. Among other things, it can allow users to define a rectangular set of grid cells as a named "parent" and modify the dimensions of the grid cells within the parent while naming them as "child" portions. This "parent and child" structure is what allows certain areas of grids made in CSS to contain arrangements of rows and columns that are not necessarily aligned with the other grid cells located outside those areas.
The site's interface makes it easy to add to the number of columns and rows that the construction portion of the site starts with, and it also makes adjusting a given row or column's width and height and adjusting the thickness of the gaps between grid cells very easy. In a feature that is very similar to what projects posted on codepen.io allow users to do, the user can have both the CSS syntax and HTML code that would produce the current template automatically generated; this makes it easy for users to grasp how CSS Grid works. For more information click here https://i.redd.it/9t578kdpx2f11.gif.