diff --git a/bin/opacity b/bin/opacity
index 4a624c5..ff5d499 100755
--- a/bin/opacity
+++ b/bin/opacity
@@ -1,6 +1,14 @@
 #!/bin/sh
 
-if [ "$TERM" = "xterm-kitty" ]
-then
-	kitty @ set-background-opacity $1
+id=$(xdotool selectwindow)
+
+before=$(xprop -id $id 32c _NET_WM_WINDOW_OPACITY | lua -e 'print(tonumber(io.read():match("= .*$"):sub(2)))')
+initial=$(xprop -id $id 32c _NET_WM_WINDOW_OPACITY | lua -e 'print(math.floor(tonumber(io.read():match("= .*$"):sub(2)) / 0xffffffff * 100 + 0.5))')
+
+((zenity --scale --title "Opacity" --value=$initial --print-partial; echo $? >&3) \
+| lua -e 'for line in io.lines() do print(string.format("0x%08x", math.floor(tonumber(line) / 100 * 0xffffffff + 0.5))) end' \
+| xargs -I{} xprop -id $id -f _NET_WM_WINDOW_OPACITY 32c -set _NET_WM_WINDOW_OPACITY {}) 3>&1 | (read xs; exit $xs)
+
+if [ $? -ne 0 ]
+then xprop -id $id -f _NET_WM_WINDOW_OPACITY 32c -set _NET_WM_WINDOW_OPACITY $before
 fi