numix-gtk-theme/gtk-3.20/scss/apps/_nautilus.scss

/************
 ! Nautilus *
*************/

@include exports("nautilus") {
    .nautilus-desktop * {
        color: $white;
        text-shadow: 1px 1px $black;

        &:active { color: $fg_color; }

        &:selected { color: $selected_fg_color; }

        &:active, &:hover, &:selected { text-shadow: none; }
    }

    .nautilus-window {
        toolbar {
            border-width: 0 0 1px;
            border-style: solid;
            border-color: border_normal($toolbar_bg_color);
        }

        .sidebar {
            border: none;
            frame { border: 0; }
        }

        paned {
            border-width: 0 1px 0 0;
            border-style: solid;

            &, &:hover {
                border-color: shade($bg_color, ($contrast + .1));
                background-color: $bg_color;
            }
        }

        notebook {
            background-color: $base_color;
            border: none;
            frame { border: 0; }
        }

        .searchbar-container {
            border-bottom: 2px solid $base_color;
            border-left-width: 0px;

            searchbar {
                padding-top: $spacing - 3px;
                padding-bottom: $spacing - 2px;
                border: none;
                background-color: $selected_bg_color;
                box-shadow: 0 1px 0 rgba(0, 0, 0, 0.1);
                
                .search {
                    border-right-width: 1px;
                
                    + button {
                        margin-left: 8px;
                    }
                }
            }
        }
    }

    button.nautilus-circular-button.image-button {
        @extend button.circular;
    }

    $disk_space_unknown: alpha($fg_color, .5);
    $disk_space_used: alpha($selected_bg_color, .8);
    $disk_space_free: shade($bg_color, .95);

    .disk-space-display {
        border-style: solid;
        border-width: 1px;

        &.unknown {
            background-color: $disk_space_unknown;
            border-color: shade($disk_space_unknown, .9);
        }

        &.used {
            background-color: $disk_space_used;
            border-color: shade($disk_space_used, .9);
        }

        &.free {
            background-color: $disk_space_free;
            border-color: shade($disk_space_free, .9);
        }
    }
}