/usr/share/themes/Menta/gtk-3.0/gtk-fallback.css is in mate-themes 3.22.16-4ubuntu1.
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 10 11 12 13 14 15 | menu {
border-image: linear-gradient(to top,
alpha(@borders, 0.80),
alpha(@borders, 0.60) 33%,
alpha(@borders, 0.50) 66%,
alpha(@borders, 0.15)) 1 1 1 1/ 1px 1px 1px 1px;
}
menubar menu {
border-image: linear-gradient(to top,
alpha(@borders, 0.80),
alpha(@borders, 0.60) 33%,
alpha(@borders, 0.50) 66%,
transparent 99%) 1 1 1 1/ 1px 1px 1px 1px;
}
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