PostCSS.sublime-settings

{
    "auto_complete_triggers":
    [
        {"characters": ".:#@", "selector": "source.css, source.postcss"},
        {"characters": "<", "selector": "text.html, text.xml"},
        {"rhs_empty": true, "selector": "punctuation.accessor"}
    ],

    // Default separators except `-`
    "word_separators": "./\\()\"':,.;<>~!@#$%^&*|+=[]{}`~?",

    // Default separator and additional `-`
    "sub_word_separators": "_-",
}