/usr/share/gnome-shell/theme/gnome-classic-high-contrast.css is in gnome-shell-extensions 3.28.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | @import url("gnome-classic.css");
stage {
-st-icon-style: symbolic;
}
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