.CSS1 File

The css1 file extension is sometimes used for Cascading Style Sheet.

The css1 file contains customized, global properties and other information about how to display HTML elements. It can define the size, background, colors, fonts, line spacing, indentation, borders, formats and location of HTML elements.

see also the CSS file extension.

How to open:

Use any suitable text editor or development suite to open or edit the *.css1 files. You can also view the *.css1 files with any modern internet browser.

How to convert:

You can convert HTML files to CSS1 with the use of some SEO tools available on the Internet.