diff --git a/.envrc b/.envrc
deleted file mode 100644
index 4a4726a..0000000
--- a/.envrc
+++ /dev/null
@@ -1 +0,0 @@
-use_nix
diff --git a/default.nix b/default.nix
deleted file mode 100644
index 7c5ea65..0000000
--- a/default.nix
+++ /dev/null
@@ -1,19 +0,0 @@
-let
-  unstableTarball = fetchTarball
-    "https://github.com/NixOS/nixpkgs/archive/nixos-unstable.tar.gz";
-  pkgs = import <nixpkgs> { };
-  unstable = import unstableTarball { };
-
-in with pkgs;
-pkgs.mkShell {
-  name = "rust";
-  buildInputs = [
-    openssl
-    pkg-config
-    unstable.cargo
-    unstable.rustc
-    unstable.rustfmt
-    unstable.rust-analyzer
-    postgresql
-  ];
-}
diff --git a/src/lib.rs b/src/lib.rs
index 2d7e297..1ee348d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -51,8 +51,8 @@ pub struct Resolution {
 
 #[derive(Debug, Default)]
 pub struct Offset {
-    pub x: usize,
-    pub y: usize,
+    pub x: isize,
+    pub y: isize,
 }
 
 pub enum Orientation {
@@ -106,16 +106,16 @@ impl Screen {
             None => return Err(CommandError::MissingMonitor(self.name.to_string())),
         };
 
-        Ok(format!("{connection}: {w}x{h} @{in_w}x{in_h} +{x}+{y} {{ForceCompositionPipeline=On, ViewPortIn={in_w}x{in_h}, ViewPortOut={w}x{h}+0+0, Rotation={rotation}}}",
-               connection=connection,
-               w=width,
-               h=height,
-               in_w=in_w,
-               in_h=in_h,
-               x=x,
-               y=y,
-               rotation=rotation,
-               ))
+        Ok(format!("{connection}: {w}x{h} @{in_w}x{in_h} {x:+}{y:+} {{ForceCompositionPipeline=On, ViewPortIn={in_w}x{in_h}, ViewPortOut={w}x{h}+0+0, Rotation={rotation}}}",
+                connection=connection,
+                w=width,
+                h=height,
+                in_w=in_w,
+                in_h=in_h,
+                x=x,
+                y=y,
+                rotation=rotation,
+        ))
     }
 }
 
@@ -167,6 +167,7 @@ mod tests {
                         width: 1920,
                         height: 1200,
                     },
+                    offset: Offset { x: 0, y: 0 },
                     orientation: Orientation::Right,
                     ..Default::default()
                 },
@@ -201,14 +202,14 @@ mod tests {
         assert_eq!(
             build_cmd_args(&map, cfg).expect("failed build_cmd_args"),
             vec![
-                "nvidia-settings",
-                "--assign",
-                "CurrentMetaMode=\
+            "nvidia-settings",
+            "--assign",
+            "CurrentMetaMode=\
             DFP-5.8: 1920x1200 @1200x1920 +0+0 {ForceCompositionPipeline=On, ViewPortIn=1200x1920, ViewPortOut=1920x1200+0+0, Rotation=270}, \
             DFP-0.1: 3440x1440 @3440x1440 +1200+0 {ForceCompositionPipeline=On, ViewPortIn=3440x1440, ViewPortOut=3440x1440+0+0, Rotation=0}, \
             DFP-0.8: 2560x1440 @2560x1440 +4640+0 {ForceCompositionPipeline=On, ViewPortIn=2560x1440, ViewPortOut=2560x1440+0+0, Rotation=0}"
 
-                    ]
+            ]
         );
     }
 
diff --git a/src/main.rs b/src/main.rs
index ca5ac40..7cfffa9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,36 +3,41 @@ use anyhow::Result;
 use fixscreen::*;
 
 fn main() -> Result<()> {
+    let dell = Screen {
+        name: ("DELL U2415".to_string()),
+        resolution: Resolution {
+            width: 1920,
+            height: 1200,
+        },
+        offset: Offset { x: 0, y: 360 },
+        ..Default::default()
+    };
+    let lg = Screen {
+        name: ("LG Electronics 34UM95".to_string()),
+        resolution: Resolution {
+            width: 3440,
+            height: 1440,
+        },
+        offset: Offset {
+            x: dell.resolution.width as isize,
+            y: 0,
+        },
+        ..Default::default()
+    };
+    let lenovo = Screen {
+        name: ("Lenovo Group Limited P27h-20".to_string()),
+        resolution: Resolution {
+            width: 2560,
+            height: 1440,
+        },
+        offset: Offset {
+            x: (dell.resolution.width + lg.resolution.width) as isize,
+            y: 0,
+        },
+        ..Default::default()
+    };
     let cfg = Config {
-        screens: vec![
-            Screen {
-                name: ("DELL U2415".to_string()),
-                resolution: Resolution {
-                    width: 1920,
-                    height: 1200,
-                },
-                orientation: Orientation::Left,
-                ..Default::default()
-            },
-            Screen {
-                name: ("LG Electronics 34UM95".to_string()),
-                resolution: Resolution {
-                    width: 3440,
-                    height: 1440,
-                },
-                offset: Offset { x: 1200, y: 0 },
-                ..Default::default()
-            },
-            Screen {
-                name: ("Lenovo Group Limited P27h-20".to_string()),
-                resolution: Resolution {
-                    width: 2560,
-                    height: 1440,
-                },
-                offset: Offset { x: 4640, y: 0 },
-                ..Default::default()
-            },
-        ],
+        screens: vec![dell, lg, lenovo],
     };
 
     let map = screen_mapping_from_xorg_log("/var/log/X.0.log")?;