diff --git a/kxstudio-gtk3.css b/kxstudio-gtk3.css
new file mode 100644
index 0000000..394d3ea
--- /dev/null
+++ b/kxstudio-gtk3.css
@@ -0,0 +1,272 @@
+/* KXStudio-Gtk3 color scheme */
+@define-color active_text   #FFFFFF;
+@define-color inactive_text #646464;
+
+@define-color button_background          #1C1C1C;
+@define-color button_border              #383838;
+@define-color button_text                #F0F0F0;
+@define-color button_hover_border        #686868;
+@define-color button_active_background   #2F2F2F;
+@define-color button_active_border       #2F2F2F;
+@define-color button_active_text         #FFFFFF;
+@define-color button_inactive_background #181818;
+@define-color button_inactive_border     #303030;
+@define-color button_inactive_text       #646464;
+
+@define-color check_border              #212121;
+@define-color check_border_hover        #3C3C3C;
+@define-color check_border_active       #4E4E4E;
+@define-color check_border_active_hover #636363;
+
+@define-color menu_background       #191919;
+@define-color menu_border           #2D2D2D;
+@define-color menu_hover_background #2F2F2F;
+@define-color menu_hover_border     #2F2F2F;
+@define-color menubar_border        #686868;
+
+@define-color scrollbar_background                 #1B1B1B;
+@define-color scrollbar_button_background          #F0F0F0;
+@define-color scrollbar_button_hover_background    #888888;
+@define-color scrollbar_button_inactive_background #5A5A5A;
+@define-color scrollbar_slider_background          #343434;
+@define-color scrollbar_slider_border              #686868;
+@define-color scrollbar_slider_hover_border        #909090;
+@define-color scrollbar_slider_inactive_background #1B1B1B;
+@define-color scrollbar_slider_inactive_border     #222222;
+
+@define-color view_background                #070707;
+@define-color view_text                      #E6E6E6;
+@define-color view_hover_background          #1A1A1A;
+@define-color view_selected_background       #262626;
+@define-color view_selected_hover_background #424242;
+
+@define-color window_background #111111;
+@define-color window_border     #222222;
+@define-color window_text       #F0F0F0;
+
+* {
+    engine:solidity;
+    background-color:@window_background;
+    border-color:@window_border;
+    border-radius:3px;
+    color:@window_text;
+    -solidity-style:0;
+    -solidity-gradient-top-color:@window_background;
+    -solidity-gradient-bottom-color:@window_background;
+    -solidity-highlight-color:@window_background;
+    -solidity-reflection-color:@window_background;
+    -solidity-shadow-color:@window_background;
+}
+*:active {
+    color:@active_text;
+}
+*:insensitive {
+    color:@inactive_text;
+}
+
+.button {
+    background-color:@button_background;
+    border-color:@button_border;
+    color:@button_text;
+    -solidity-gradient-top-color:@button_background;
+    -solidity-gradient-bottom-color:@button_background;
+    -solidity-highlight-color:@button_background;
+    -solidity-reflection-color:@button_background;
+    -solidity-shadow-color:@button_background;
+}
+.button:hover {
+    border-color:@button_hover_border;
+    -solidity-highlight-color:@button_hover_border;
+}
+.button:active {
+    background-color:@button_active_background;
+    border-color:@button_active_border;
+    color:@button_active_text;
+    -solidity-gradient-top-color:@button_active_background;
+    -solidity-gradient-bottom-color:@button_active_background;
+    -solidity-highlight-color:@button_active_background;
+    -solidity-reflection-color:@button_active_background;
+    -solidity-shadow-color:@button_active_background;
+}
+.button:insensitive {
+    background-color:@button_inactive_background;
+    border-color:@button_inactive_border;
+    color:@button_inactive_text;
+    -solidity-gradient-top-color:@button_inactive_background;
+    -solidity-gradient-bottom-color:@button_inactive_background;
+    -solidity-highlight-color:@button_inactive_background;
+    -solidity-reflection-color:@button_inactive_background;
+    -solidity-shadow-color:@button_inactive_background;
+}
+
+.check, .menuitem.check,
+.radio, .menuitem.radio {
+    border-color:@check_border;
+}
+
+.check:hover, .menuitem.check:hover,
+.radio:hover, .menuitem.radio:hover {
+    border-color:@check_border_hover;
+}
+
+.check:active, .menuitem.check:active,
+.radio:active, .menuitem.radio:active {
+    border-color:@check_border_active;
+}
+
+.check:active:hover, .menuitem.check:active:hover,
+.radio:active:hover, .menuitem.radio:active:hover {
+    border-color:@check_border_active_hover;
+}
+
+.menu {
+    background-color:@menu_background;
+    border-color:@menu_border;
+}
+
+.menubar {
+    border-color:@menubar_border;
+    -solidity-radius:5;
+}
+
+.menuitem {
+    padding:2px;
+    -GtkMenuItem-arrow-scaling: 0.5;
+}
+.menuitem:hover {
+    background-color:@menu_hover_background;
+    border-color:@menu_hover_border;
+    -solidity-gradient-top-color:@menu_hover_background;
+    -solidity-gradient-bottom-color:@menu_hover_background;
+    -solidity-highlight-color:@menu_hover_background;
+    -solidity-reflection-color:@menu_hover_background;
+    -solidity-shadow-color:@menu_hover_background;
+}
+/* override menuitem:hover */
+.menubar:hover {
+    border-color:@menubar_border;
+}
+
+.notebook tab {
+    background-color:@button_background;
+    border-color:@window_background;
+    padding:4px;
+    -solidity-style:3;
+    -solidity-gradient-top-color:@button_background;
+    -solidity-gradient-bottom-color:@button_background;
+    -solidity-highlight-color:@window_border;
+    -solidity-reflection-color:@button_background;
+    -solidity-shadow-color:@button_background;
+}
+.notebook tab:active {
+    background-color:@window_background;
+    border-color:@button_background;
+}
+
+/*.progressbar {
+    background-color:@scrollbar_background;
+    -solidity-gradient-top-color:@scrollbar_background;
+    -solidity-gradient-bottom-color:@scrollbar_background;
+    -solidity-highlight-color:@scrollbar_background;
+    -solidity-reflection-color:@scrollbar_background;
+    -solidity-shadow-color:@scrollbar_background;
+}*/
+/* FIXME */
+.progressbar {
+    background-color:@scrollbar_slider_background;
+    border-color:@scrollbar_slider_border;
+    -solidity-gradient-top-color:@scrollbar_slider_background;
+    -solidity-gradient-bottom-color:@scrollbar_slider_background;
+    -solidity-highlight-color:@scrollbar_slider_background;
+    -solidity-reflection-color:@scrollbar_slider_background;
+    -solidity-shadow-color:@scrollbar_slider_background;
+}
+
+.rubberband {
+  /* TODO */
+}
+
+.separator {
+    color:@window_border;
+    -solidity-style:0;
+}
+
+.scrollbar {
+    background-color:@scrollbar_background;
+    -solidity-radius:5;
+    -solidity-gradient-top-color:@scrollbar_background;
+    -solidity-gradient-bottom-color:@scrollbar_background;
+    -solidity-highlight-color:@scrollbar_background;
+    -solidity-reflection-color:@scrollbar_background;
+    -solidity-shadow-color:@scrollbar_background;
+    -GtkScrollbar-has-backward-stepper:true;
+    -GtkScrollbar-has-forward-stepper:true;
+    -GtkRange-slider-width:12px;
+    -GtkRange-trough-border:0;
+}
+.scrollbar.button {
+    color:@scrollbar_button_background;
+}
+.scrollbar.button:hover {
+    color:@scrollbar_button_hover_background;
+}
+.scrollbar.button:insensitive {
+    color:@scrollbar_button_inactive_background;
+}
+.scrollbar.slider {
+    background-color:@scrollbar_slider_background;
+    border-color:@scrollbar_slider_border;
+    -solidity-gradient-top-color:@scrollbar_slider_background;
+    -solidity-gradient-bottom-color:@scrollbar_slider_background;
+    -solidity-highlight-color:@scrollbar_slider_background;
+    -solidity-reflection-color:@scrollbar_slider_background;
+    -solidity-shadow-color:@scrollbar_slider_background;
+}
+.scrollbar.slider:hover {
+    border-color:@scrollbar_slider_hover_border;
+}
+.scrollbar.slider:insensitive {
+    background-color:@scrollbar_slider_inactive_background;
+    border-color:@scrollbar_slider_inactive_border;
+    -solidity-gradient-top-color:@scrollbar_slider_inactive_background;
+    -solidity-gradient-bottom-color:@scrollbar_slider_inactive_background;
+    -solidity-highlight-color:@scrollbar_slider_inactive_background;
+    -solidity-reflection-color:@scrollbar_slider_inactive_background;
+    -solidity-shadow-color:@scrollbar_slider_inactive_background;
+}
+.scrollbar.trough {
+    background-color:@window_background;
+    border-color:@window_background;
+    -solidity-gradient-top-color:@window_background;
+    -solidity-gradient-bottom-color:@window_background;
+    -solidity-highlight-color:@window_background;
+    -solidity-reflection-color:@window_background;
+    -solidity-shadow-color:@window_background;
+}
+
+.toolbar {
+    padding:2px;
+}
+.toolbar .button {
+    padding:4px;
+}
+
+.view, .entry {
+    background-color:@view_background;
+    color:@view_text;
+    padding:3px;
+    -solidity-gradient-top-color:@view_background;
+    -solidity-gradient-bottom-color:@view_background;
+    -solidity-highlight-color:@view_background;
+    -solidity-reflection-color:@view_background;
+    -solidity-shadow-color:@view_background;
+}
+.view:hover, .entry:hover {
+    background-color:@view_hover_background;
+}
+.view:selected, .entry:selected {
+    background-color:@view_selected_background;
+}
+.view:hover:selected, .entry:hover:selected {
+    background-color:@view_selected_hover_background;
+}