Cascading style sheets can do a lot of heavy lifting for you since it can control multiple HTML page layouts. You can define the design and layout, including display variations for the user's screen size using CSS. The language was co-created by Bert Bos and Håkon Wium Lie.
Before the World Wide Web Consortium (W3C) developed CSS, building a large website using HTML was a nightmare. They had to add style information, like the font, to every page. If you want to change the background color of your website, you only have to change one line of code. Before, you had to change the code on every page.
While it only takes a few keystrokes now to style a pager, you can't do it with just one one. You can create a layout in one line; grid-template: auto 1fr auto / auto 1fr auto, but you'll need to add more styling. You can do one line, but your site wouldn't look good.
CSS keeps getting better. Originally released in 1996, we how have CSS2 and CSS3, which add more functionality. For example, CSS3 supports responsive layouts.If you want to design your own site, you must learn CSS after mastering HTML and XHTML
Learning CSS isn't difficult. You don't have to memorize every command; there are plenty of free resources online. Just learn the fundamentals and look up the specifics. Many people start learning CSS working with WordPress themes. Access the style.css file, which every theme has, and practice what you've learned in a tutorial. W3schools have an excellent, easy-to-understand tutorial; you can learn borders, colors, fonts and more.
Other websites also have free tutorials and places for you to practice what you've learned. If you plan to be a web designer, understanding CSS is essential for creating consistency in design throughout a website. For more information click here https://web.dev/one-line-layouts/.