EditorConfig is supported by a lot of editors. You can check whether your editor is supported or not on the official website, https://www.editorconfig.org.

You need to create a file called .editorconfig in your root directory – the configuration I use is this one:

  root = true

  [*]
  indent_style = space 
  indent_size = 2
  end_of_line = lf
  charset = utf-8 
  trim_trailing_whitespace = true 
  insert_final_newline = true

  [*.html] 
  indent_size = 4

  [*.css] 
  indent_size = 4

  [*.md]
  trim_trailing_whitespace = false

You can affect all the files with [], and specific files with [.extension].