Among the 15~ million lines of codes in the GCC source code, there is a single CSS line.
Who dares to call CSS bloat now? More like GSS eh.
$ cloc gcc-13.2.0
github.com/AlDanial/cloc v 1.98 T=113.87 s (1029.7 files/s, 143776.9 lines/s)
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Language files blank comment code
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C++ 31144 610803 701522 2961450
C 50773 410175 635758 2033424
PO File 44 332336 443572 916826
Ada 6610 290082 396614 831278
Go 5347 102068 191016 769730
...
Brainf*** 1 3 4 10
Lisp 1 4 12 7
DOS Batch 2 0 0 4
CSS 1 0 0 1
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SUM: 117256 2322548 2988111 11061312
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Looking at the link that was posted it appears to be a dummy CSS file to test some part of the go standard library that works with html and CSS.