diff --git a/Email Slicer/EmailSlicer.py b/Email Slicer/EmailSlicer.py
index e6506ad5..54171bcf 100644
--- a/Email Slicer/EmailSlicer.py	
+++ b/Email Slicer/EmailSlicer.py	
@@ -1,5 +1,21 @@
+import re
+
+def isValidEmail(email):
+
+    # Regular expression for validating an Email
+    regex = r'\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b'
+ 
+    if(re.fullmatch(regex, email)):
+        return True
+    else:
+        return False
+
 email = input("Enter your email id - ")
-username = email[0:email.index('@')]
-domain = email[email.index('@')+1: ]
-print("Username - ", username)
-print("Domain - ", domain)
+
+if isValidEmail(email):
+    username = email[0:email.index('@')]
+    domain = email[email.index('@')+1: ]
+    print("Username - ", username)
+    print("Domain - ", domain)
+else:
+    print("Invalid Email!")
\ No newline at end of file
diff --git a/Smart_Calculator/calculator.py b/Smart_Calculator/calculator.py
index e0a23ee2..7a99bc44 100644
--- a/Smart_Calculator/calculator.py
+++ b/Smart_Calculator/calculator.py
@@ -60,7 +60,7 @@ def calculate():
             'SUB':sub, 'DIFFERENCE':sub, 'MINUS': sub, 'SUBTRACT':sub,
             'LCM':lcm, 'HCF':hcf, 'PRODUCT':mul, 'MULTIPLICATION':mul,
             'MULTIPLY':mul, 'DIVISION':div, 'DIV':div, 'DIVIDE':div,
-            'MOD':mod,'REMANDER':mod, 'MODULUS':mod}
+            'MOD':mod,'REMAINDER':mod, 'MODULUS':mod}
 
 
 win = Tk()
@@ -68,21 +68,28 @@ def calculate():
 win.geometry('500x300')
 win.configure(bg='lightskyblue')
 
-l1 = Label(win, text='I am a smart calculator', width=20, padx=3)
-l1.place(x=150,y=10)
-l2 = Label(win, text='My name is Leah', padx=3)
-l2.place(x=180,y=40)
-l3 = Label(win, text='What can I help you?', padx=3)
-l3.place(x=176,y=130)
+win.resizable(0, 0)
+win.columnconfigure(0, weight=1)
+win.columnconfigure(1, weight=2)
+win.columnconfigure(2, weight=1)
+
+l1 = Label(win, text='I am a smart calculator', width=20)
+l1.grid(column=1, row=1, padx=5, pady=10)
+
+l2 = Label(win, text='My name is Leah', width=20)
+l2.grid(column=1, row=2, padx=5, pady=10)
+
+l3 = Label(win, text='What can I help you?', width=20)
+l3.grid(column=1, row=3, padx=5, pady=10)
 
 textin = StringVar()
-e1 = Entry(win, width=30,textvariable=textin)
-e1.place(x=100,y=160)
+e1 = Entry(win, width=30, textvariable=textin)
+e1.grid(column=1, row=4, padx=5, pady=10)
 
-b1 = Button(win, text='Just this',command=calculate)
-b1.place(x=210,y=200)
+b1 = Button(win, text='Just this', command=calculate)
+b1.grid(column=1, row=5, padx=5, pady=10)
 
-list = Listbox(win,width=20,height=3)
-list.place(x=150,y=230)
+list = Listbox(win, width=40, height=3)
+list.grid(column=1, row=6, padx=5, pady=10)
 
 win.mainloop()