This file is indexed.

/usr/share/caja/caja-desktop.css is in caja-common 1.16.6-1+deb9u1.

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

The actual contents of the file can be viewed below.

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/* Everything that themes must not override goes in this file */
/* This is loaded with GTK_STYLE_PROVIDER_PRIORITY_APPLICATION and overrides themes */

.caja-desktop-window,
.caja-desktop:not(:selected):not(:active):not(.rubberband){
	background-color: transparent;
}

/* desktop mode */
.caja-desktop.caja-canvas-item {
    color: #ffffff;
    text-shadow: 1px 1px alpha (#000000, 0.8);
}

.caja-desktop.caja-canvas-item:selected,
.caja-desktop.caja-canvas-item:active,
.caja-desktop.caja-canvas-item:hover {
    text-shadow: none;
}

/* remove possible theme settings for borders on scrolledwindow with gtk+-3.20 */
.caja-desktop-window > grid.vertical > box.vertical > box.vertical > box.vertical > scrolledwindow,
.caja-desktop-window > grid.vertical > box.vertical > box.vertical > box.vertical > scrolledwindow.frame,
.caja-desktop-window > grid.vertical > box.vertical > box.vertical > box.vertical > scrolledwindow > widget.view.caja-desktop {
   border-width: 0px;
   border-style: none;
   border-radius: 0px;
}

/* This is not on the desktop but will cause errors if themes can override */
/* Padding in slider buttons causes GTK errors in GTK 3.20 or later */
.caja-navigation-window .slider-button {
	padding: 0px;
}