diff --git a/SLS_Python/sls_calc/__main__.py b/SLS_Python/sls_calc/__main__.py
index e8565f3..8105afe 100644
--- a/SLS_Python/sls_calc/__main__.py
+++ b/SLS_Python/sls_calc/__main__.py
@@ -12,7 +12,7 @@ class HPCalculator:
     def __init__(self, root):
         self.root = root
         self.root.title("HP Stack Calculator")
-        self.root.geometry("450x650")
+        # self.root.geometry("450x650")
         self.root.resizable(False, False)
         
         # Initialize interpreter
@@ -24,24 +24,8 @@ class HPCalculator:
         self.is_new_entry = True
         
         # Set up UI
-        self.setup_styles()
         self.create_widgets()
         
-    def setup_styles(self):
-        """Configure custom styles for the calculator"""
-        style = ttk.Style()
-        style.theme_use('clam')
-        
-        # Configure button styles
-        style.configure('Calc.TButton',
-                       font=('Arial', 12, 'bold'),
-                       padding=10)
-        style.configure('Display.TLabel',
-                       font=('Courier', 14),
-                       background='#f0f0f0',
-                       relief='sunken',
-                       padding=5)
-        
     def create_widgets(self):
         """Create all calculator widgets"""
         # Main container
@@ -65,8 +49,7 @@ class HPCalculator:
         self.stack_labels = []
         for i in range(4):
             label = ttk.Label(stack_frame,
-                            text=f"T{3-i}: 0",
-                            style='Display.TLabel',
+                            text=f"T{3-i}: <>",
                             anchor='e',
                             width=30)
             label.grid(row=i, column=0, sticky=(tk.W, tk.E), pady=2)
@@ -78,46 +61,35 @@ class HPCalculator:
         entry_frame.grid(row=1, column=0, columnspan=4, sticky=(tk.W, tk.E), pady=(0, 10))
         
         self.entry_label = ttk.Label(entry_frame,
-                                     text="0",
-                                     style='Display.TLabel',
-                                     anchor='e',
-                                     font=('Courier', 16, 'bold'))
+                                    text="0",
+                                    anchor='e',
+                                    font=('Courier', 16))
         self.entry_label.grid(row=0, column=0, sticky=(tk.W, tk.E))
         
     def create_button_grid(self, parent):
         """Create the calculator button grid"""
         buttons = [
-            # Row 1: Stack operations
-            [('√', self.sqrt), ('x²', self.square), ('1/x', self.reciprocal), ('÷', self.divide)],
-            # Row 2: Numbers and operations
-            [('7', lambda: self.digit('7')), ('8', lambda: self.digit('8')), 
-             ('9', lambda: self.digit('9')), ('×', self.multiply)],
-            # Row 3
-            [('4', lambda: self.digit('4')), ('5', lambda: self.digit('5')), 
-             ('6', lambda: self.digit('6')), ('−', self.subtract)],
-            # Row 4
-            [('1', lambda: self.digit('1')), ('2', lambda: self.digit('2')), 
-             ('3', lambda: self.digit('3')), ('+', self.add)],
-            # Row 5
-            [('0', lambda: self.digit('0')), ('.', self.decimal), 
-             ('±', self.negate), ('ENTER', self.enter)],
-            # Row 6: Special functions
-            [('SWAP', self.swap), ('DROP', self.drop), 
-             ('DUP', self.dup), ('CLR', self.clear)]
+            [('√', self.sqrt), ('x²', self.square), ('1/x', self.reciprocal), ('NULL', lambda: None)],
+            [('ENTER', lambda: self.enter(True)), ('SWAP', self.swap), ('<-', self.drop), ('NULL', lambda: None)],
+            [('7', lambda: self.digit('7')), ('8', lambda: self.digit('8')), ('9', lambda: self.digit('9')), ('÷', self.divide)],
+            [('4', lambda: self.digit('4')), ('5', lambda: self.digit('5')), ('6', lambda: self.digit('6')), ('×', self.multiply)],
+            [('1', lambda: self.digit('1')), ('2', lambda: self.digit('2')), ('3', lambda: self.digit('3')), ('−', self.subtract)],
+            [('0', lambda: self.digit('0')), ('.', self.decimal), ('±', self.negate), ('+', self.add)],
         ]
         
         for row_idx, row in enumerate(buttons, start=2):
             for col_idx, (text, command) in enumerate(row):
-                btn = ttk.Button(parent,
-                               text=text,
-                               command=command,
-                               style='Calc.TButton',
-                               width=8)
-                btn.grid(row=row_idx, column=col_idx, padx=2, pady=2, sticky=(tk.W, tk.E, tk.N, tk.S))
+                if text != "NULL":
+                    btn = ttk.Button(parent,
+                                    text=text,
+                                    command=command,
+                                    width=8)
+                    btn.grid(row=row_idx, column=col_idx, padx=2, pady=2, sticky=(tk.W, tk.E, tk.N, tk.S))
         
         # Keyboard bindings
-        self.root.bind('<Return>', lambda e: self.enter())
-        self.root.bind('<KP_Enter>', lambda e: self.enter())
+        self.root.bind('<Delete>', lambda e: self.drop())
+        self.root.bind('<Return>', lambda e: self.enter(True))
+        self.root.bind('<KP_Enter>', lambda e: self.enter(True))
         for i in range(10):
             self.root.bind(str(i), lambda e, n=str(i): self.digit(n))
         self.root.bind('.', lambda e: self.decimal())
@@ -125,7 +97,6 @@ class HPCalculator:
         self.root.bind('-', lambda e: self.subtract())
         self.root.bind('*', lambda e: self.multiply())
         self.root.bind('/', lambda e: self.divide())
-        self.root.bind('<Escape>', lambda e: self.clear())
         
     def digit(self, d):
         """Handle digit button press"""
@@ -157,12 +128,14 @@ class HPCalculator:
                 self.entry_buffer = '-' + self.entry_buffer
         self.update_entry_display()
         
-    def enter(self):
+    def enter(self, key=False):
         """Push current entry onto stack"""
         if self.entry_buffer:
             self.execute_code(self.entry_buffer)
             self.entry_buffer = ""
             self.is_new_entry = True
+        elif key:
+            self.execute_code("dup")
         self.update_displays()
         
     def add(self):
@@ -219,21 +192,6 @@ class HPCalculator:
         self.execute_code("drop")
         self.update_displays()
         
-    def dup(self):
-        """Duplicate top stack item"""
-        self.enter()
-        self.execute_code("dup")
-        self.update_displays()
-        
-    def clear(self):
-        """Clear entry and stack"""
-        self.entry_buffer = ""
-        self.is_new_entry = True
-        # Clear the stack
-        while len(self.interp.stack) > 0:
-            self.interp.pop()
-        self.update_displays()
-        
     def execute_code(self, code):
         """Execute stack language code"""
         try:
@@ -274,7 +232,7 @@ class HPCalculator:
                 value_str = self.format_stack_entry(entry)
                 self.stack_labels[i].config(text=f"T{level}: {value_str}")
             else:
-                self.stack_labels[i].config(text=f"T{level}: 0")
+                self.stack_labels[i].config(text=f"T{level}: <>")
                 
     def format_stack_entry(self, entry):
         """Format a stack entry for display"""