How to download and setup atom-language-postcss
Open terminal and run command
                                            git clone https://github.com/azat-io/atom-language-postcss.git
                                        
                                        git clone is used to create a copy or clone of atom-language-postcss repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with atom-language-postcss https://github.com/azat-io/atom-language-postcss/archive/master.zip
Or simply clone atom-language-postcss with SSH
                                            [email protected]:azat-io/atom-language-postcss.git                                    
                                    If you have some problems with atom-language-postcss
You may open issue on atom-language-postcss support forum (system) here: https://github.com/azat-io/atom-language-postcss/issuesSimilar to atom-language-postcss repositories
Here you may see atom-language-postcss alternatives and analogs
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