This file is indexed.

/etc/ngraph-gtk/gtk/ngraph.css is in libngraph0 6.07.02-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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textview#line_number > text {
    border-right: 1px solid @fg_color;
}
textview#line_number {
    padding-right: 1px;
}