The issue of website scalability is relevant for every web designer. Agree, creating an author’s visual product, I want it to remain equally beautiful and convenient for users of any devices. 

The option is unacceptable when a blog or website looks fine on a screen with a resolution of 1920x1080px and is completely unreadable on a smartphone screen with parameters of 240x320px.

10-15 years ago there was no such variety and number of monitors. Therefore, designing websites was easy. You create a regular static design for a fixed screen width and you can rest assured that most users will see the site as intended.

Today, users have not only monitors with the most different resolutions, 3.5 billion people access the Internet from mobile devices – netbooks, tablets, smartphones, etc. Building sites using old methods is no longer comme il faut.