/usr/share/ddd/themes/red.vsl is in ddd 1:3.3.12-5.
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 6 7 8 9 | // $Id: red.vsl 6405 2003-05-24 15:27:46Z apg $
// Red background. Use this with a self-defined button
// associated with the command `graph apply red.vsl "()"'.
#pragma override old_value_box
old_value_box(...) = value_box(...);
#pragma override value_box
value_box(value) -> color(old_value_box(value), "black", "#ffc0c0");
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