diff --git a/home/user/.config/tmux/mappings.conf b/home/user/.config/tmux/mappings.conf
index 5800fc8..eeb6f3d 100644
--- a/home/user/.config/tmux/mappings.conf
+++ b/home/user/.config/tmux/mappings.conf
@@ -148,15 +148,18 @@ bind -r "<" swap-window -d -t -1
 bind -r ">" swap-window -d -t +1
 
 
+_tmux_new_pane_size="30%"
+_tmux_main_pane_size="70%"
+
 # Windows splitting
-bind -n M-Enter split-window -h -l 37% -c "#{pane_current_path}"
+bind -n M-Enter split-window -h -b -l $_tmux_new_pane_size -c "#{pane_current_path}"
 bind -n M-t split-window -v -l 20% -c "#{pane_current_path}"
 bind \\ split-window -h -c "#{pane_current_path}"
 bind - split-window -v -c "#{pane_current_path}"
 
 
 # Default layout size
-bind -n M-u resize-pane -x 70%
+bind -n M-u resize-pane -x $_tmux_main_pane_size
 
 
 # Copy mode
diff --git a/home/user/.tmux/01.sh b/home/user/.tmux/01.sh
index f5febe7..3f37d40 100755
--- a/home/user/.tmux/01.sh
+++ b/home/user/.tmux/01.sh
@@ -11,7 +11,7 @@ if ! tmux has-session -t "$SESSION"; then
     tmux new-session -s "$SESSION" -d -n "$MAINW" -c "$WORKING_PROJECT"
     tmux send-keys -t "$SESSION:$MAINW" '$EDITOR' Enter
     tmux send-keys -t "$SESSION:$MAINW" , f f
-    tmux splitw -t "$SESSION:$MAINW" -d -b -h -l 30% -c '#{pane_current_path}'
+    tmux splitw -t "$SESSION:$MAINW" -d -b -h -l $_tmux_new_pane_size -c '#{pane_current_path}'
 fi
 
 tmux switch-client -t "$SESSION"
\ No newline at end of file