Being the language used in website designs, CSS is one of the language supported by Vim's auto-complete feature.

To start using the feature, enter the following while in Vim's command mode.

Step-by-step video guide:
:set omnifunc=csscomplete#CompleteCSS

That will enable CSS auto-completion in Vim. To use it, press Ctrl + x followed by Ctrl + o while partially typing CSS codes.

The following is a sample screenshot.

You can use the arrow key to navigate through the list to choose your desired auto-complete suggestion.

Automatically enable auto-complete for CSS files

To automatically enable CSS auto-complete every time opening a CSS file, add the following line to your ~/.vimrc;

autocmd FileType css set omnifunc=csscomplete#CompleteCSS
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