diff --git a/manifest.json b/manifest.json
index e69de29..b1f1678 100644
--- a/manifest.json
+++ b/manifest.json
@@ -0,0 +1,12 @@
+{
+    "manifest_version": "1",
+    "name": "one-dark",
+    "display_name": "One Dark",
+    "extend_theme": "dark",
+    "css_file": "theme.css",
+    "css_file_gtk_3.20+": "theme-gtk-3.20.css",
+    "matched_text_hl_colors": {
+        "when_selected": "#fff",
+        "when_not_selected": "#fff"
+    }
+}
\ No newline at end of file
diff --git a/theme-gtk-3.20.css b/theme-gtk-3.20.css
index e69de29..d9a8916 100644
--- a/theme-gtk-3.20.css
+++ b/theme-gtk-3.20.css
@@ -0,0 +1,9 @@
+@import url("theme.css");
+
+.input {
+    caret-color: @caret_color;
+}
+.selected.item-box {
+    /* workaround for a bug in GTK+ < 3.20 */
+    border: none;
+}
diff --git a/theme.css b/theme.css
index e69de29..46a6a64 100644
--- a/theme.css
+++ b/theme.css
@@ -0,0 +1,85 @@
+/**
+ * App Window
+ */
+@define-color bg_color #393D40;
+@define-color window_bg @bg_color;
+@define-color window_border_color #393939;
+@define-color prefs_backgroud #aaa;
+
+/**
+ * Input
+ */
+@define-color selected_bg_color #4B5053;
+@define-color selected_fg_color #d5d5d5;
+@define-color input_color #ddd;
+@define-color caret_color darker(@input_color);
+
+/**
+ * Result items
+ */
+@define-color item_name #B3BAB8;
+@define-color item_text #999;
+@define-color item_box_selected #4B5053;
+@define-color item_text_selected #ccc;
+@define-color item_name_selected #bbb;
+@define-color item_shortcut_color #777;
+@define-color item_shortcut_shadow darker(@bg_color);
+@define-color item_shortcut_color_sel #ccc;
+@define-color item_shortcut_shadow_sel darker(@item_box_selected);
+
+.app {
+    background-color: @window_bg;
+    border-color: @window_border_color;
+}
+
+.input {
+    color: @input_color;
+}
+
+/**
+ * Selected text in input
+ */
+.input *:selected,
+.input *:focus,
+*:selected:focus {
+    background-color: alpha (@selected_bg_color, 0.9);
+    color: @selected_fg_color;
+}
+
+.item-text {
+    color: @item_text;
+}
+.item-name {
+    color: @item_name;
+}
+
+.selected.item-box {
+    background-color: @item_box_selected;
+    border-left: 1px solid @window_border_color;
+    border-right: 1px solid @window_border_color;
+}
+.selected.item-box .item-text {
+    color: @item_text_selected;
+}
+.selected.item-box .item-name {
+    color: @item_name_selected;
+}
+.item-shortcut {
+    color: @item_shortcut_color;
+    text-shadow: 1px 1px 1px @item_shortcut_shadow;
+}
+.selected.item-box .item-shortcut {
+    color: @item_shortcut_color_sel;
+    text-shadow: 1px 1px 1px @item_shortcut_shadow_sel;
+}
+
+.prefs-btn {
+    opacity: 0.8;
+}
+.prefs-btn:hover {
+    background-color: @prefs_backgroud;
+}
+
+.no-window-shadow {
+    margin: -20px;
+}
\ No newline at end of file