numix-gtk-theme/gtk-3.0/gtk-widgets-assets-dark.css

/*******************
* check and radio *
*******************/
/* draw regular check and radio items using our assets */
.check,
.check:focus,
.check row:selected,
.check row:selected:focus {
	-gtk-icon-source: url("assets/checkbox-unchecked-dark.svg");
}

.check:insensitive,
.check row:selected:insensitive,
.check row:selected:focus:insensitive {
	-gtk-icon-source: url("assets/checkbox-unchecked-insensitive-dark.svg");
}

.check:active,
.check:checked,
.check:checked row:selected,
.check row:selected:active,
.check row:selected:focus:active {
	-gtk-icon-source: url("assets/checkbox-checked-dark.svg");
}

.check:active:insensitive,
.check row:selected:active:insensitive,
.check row:selected:focus:active:insensitive {
	-gtk-icon-source: url("assets/checkbox-checked-insensitive-dark.svg");
}

.check:inconsistent,
.check row:selected:inconsistent,
.check row:selected:focus:inconsistent {
	-gtk-icon-source: url("assets/checkbox-mixed-dark.svg");
}

.check:inconsistent:insensitive,
.check row:selected:inconsistent:insensitive,
.check row:selected:focus:inconsistent:insensitive {
	-gtk-icon-source: url("assets/checkbox-mixed-insensitive-dark.svg");
}

.radio,
.radio row:selected,
.radio row:selected:focus {
	-gtk-icon-source: url("assets/radio-unselected-dark.svg");
}

.radio:insensitive,
.radio row:selected:insensitive,
.radio row:selected:focus:insensitive {
	-gtk-icon-source: url("assets/radio-unselected-insensitive-dark.svg");
}

.radio:active,
.radio:checked,
.radio row:selected:active,
.radio row:selected:focus:active {
	-gtk-icon-source: url("assets/radio-selected-dark.svg");
}

.radio:active:insensitive,
.radio row:selected:active:insensitive,
.radio row:selected:focus:active:insensitive {
	-gtk-icon-source: url("assets/radio-selected-insensitive-dark.svg");
}

.radio:inconsistent,
.radio row:selected:inconsistent,
.radio row:selected:focus:inconsistent {
	-gtk-icon-source: url("assets/radio-mixed-dark.svg");
}

.radio:inconsistent:insensitive,
.radio row:selected:inconsistent:insensitive,
.radio row:selected:focus:inconsistent:insensitive {
	-gtk-icon-source: url("assets/radio-mixed-insensitive-dark.svg");
}

.menuitem.check {
	-gtk-icon-source: none;
}

.menuitem.radio {
	-gtk-icon-source: none;
}

GtkIconView.content-view.cell.check {
	-gtk-icon-source: url("assets/grid-selection-unchecked-dark.svg");
}

GtkIconView.content-view.cell.check:active {
	-gtk-icon-source: url("assets/grid-selection-checked-dark.svg");
}