Translation from English gives us the concept of "cascading style tables.
They store styles of various elements HTML-documents: borders, pouring, color, size, relative location and more.
Assigning styles to elements can be done directly in web document code using the Style tag.
But to speed up the loading of pages, it is better to use another option - displaying styles in separate CSS files. In this case, the probability of the formation of positive behavioral factors, since the download speed of the website is one of the fundamental points that affect the opinion of users about it.