[UPDATE][I3] Make rofi use dmenu skin

I wanted the launcher to take the same size as my previous dmenu
launcher when invoked with `mod+d` or `mod+Shift+d` instead of my usual
rofi theme.

The default dmenu theme is too big so I adapted it for my needs.

i3/.config/i3/config

@@ -34,11 +34,11 @@ bindsym $mod+Return exec i3-sensible-terminal
 bindsym $mod+Shift+q kill
 
 # start rofi (a program launcher)
-bindsym $mod+Shift+d exec rofi -show run
+bindsym $mod+Shift+d exec --no-startup-id rofi -show run -width 100 -disable-history -theme my_dmenu
 # There also is the (new) i3-dmenu-desktop which only displays applications
 # shipping a .desktop file. It is a wrapper around dmenu, so you need that
 # installed.
-bindsym $mod+d exec --no-startup-id i3-dmenu-desktop
+bindsym $mod+d exec --no-startup-id rofi -show drun -width 100 -disable-history -theme my_dmenu
 
 # change focus
 bindsym $mod+h focus left

rofi/.config/rofi/my_dmenu.rasi

@@ -0,0 +1,43 @@
+/**
+ * ROFI Color theme
+ * Derived from the official dmenu theme
+ * Original Copyright to Dave Davenport
+ */
+* {
+    background-color:      Black;
+    border-color:          White;
+    text-color:           White;
+    font:            "Mono Sans 9";
+}
+
+#window {
+    anchor:     north;
+    location:   north;
+    width:      100%;
+    padding:    4px;
+    children:   [ horibox ];
+}
+
+#horibox {
+    orientation: horizontal;
+    children:   [ prompt, entry, listview ];
+}
+
+#listview {
+    layout:     horizontal;
+    spacing:    5px;
+    lines:      100;
+}
+
+#entry {
+    expand:     false;
+    width:      10em;
+}
+
+#element {
+    padding: 0px 2px;
+}
+#element selected {
+    background-color: SteelBlue;
+}
+