diff --git a/pkgs/eyezoom.nix b/pkgs/eyezoom.nix
index 68ee2c9..3fb7d0c 100644
--- a/pkgs/eyezoom.nix
+++ b/pkgs/eyezoom.nix
@@ -1,17 +1,23 @@
 { pkgs, ... }:
 pkgs.writeScript "eyezoom" ''
-W=1920
-H=1080
+arg="$1"
 
-offx=1600
-offy=0
+set -- $(
+  ${pkgs.xorg.xrandr}/bin/xrandr | 
+    ${pkgs.gawk}/bin/awk -F "[x+ ]" '/primary/ { print $4" "$5" "$6" "$7 }'
+  )
+
+W="$1"
+H="$2"
+offx="$3"
+offy="$4"
 
 HFACTOR=10
 WFACTOR=4
 
 WIDEDIV=2
 
-case "$1" in
+case "$arg" in
   eye)
     ${pkgs.wmctrl}/bin/wmctrl -R ':ACTIVE:' -e 0,$offx,$(( offy - (H * HFACTOR / 2) + (H / 2) )),$W,$((H*HFACTOR))
   ;;