/usr/share/gocode/src/github.com/alecthomas/chroma/lexers/testdata/css.actual is in golang-github-alecthomas-chroma-dev 0.4.0+git20180402.51d250f-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | :root {
--variable-name: #fff;
}
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