diff --git a/app/src/main/java/com/magdamiu/androidfundamentalsmai2021/MainActivity.java b/app/src/main/java/com/magdamiu/androidfundamentalsmai2021/MainActivity.java
index 2a58587..983e907 100644
--- a/app/src/main/java/com/magdamiu/androidfundamentalsmai2021/MainActivity.java
+++ b/app/src/main/java/com/magdamiu/androidfundamentalsmai2021/MainActivity.java
@@ -4,57 +4,19 @@
 
 import android.os.Bundle;
 import android.util.Log;
-import android.view.View;
-import android.widget.Button;
-import android.widget.EditText;
-import android.widget.TextView;
-import android.widget.Toast;
 
 public class MainActivity extends AppCompatActivity {
 
-    private EditText editTextName;
-    private Button buttonDisplayGreetings;
-    private TextView textViewGreetings;
-
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        /*setContentView(R.layout.activity_main);*/
-        setContentView(R.layout.sample);
-
-        initViews();
+        setContentView(R.layout.activity_main);
         displayLogs();
     }
 
-    private void initViews() {
-        editTextName = findViewById(R.id.editTextName);
-        buttonDisplayGreetings = findViewById(R.id.buttonDisplayGreetings);
-        textViewGreetings = findViewById(R.id.textViewGreetings);
-    }
-
     private void displayLogs() {
         Log.e("tag-error", "my first error log");
         Log.v("tag-verbose", "my first verbose log");
         Log.w("tag-warning", "my first warning log");
     }
-
-    private void clickOnDisplayGreetingsButton() {
-        buttonDisplayGreetings.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View view) {
-
-            }
-        });
-    }
-
-    public void displayGreetingsOnClick(View view) {
-        textViewGreetings.setText("");
-        String inputName = editTextName.getText().toString();
-        if (inputName.length() > 0) {
-            textViewGreetings.setText(inputName);
-        } else {
-            editTextName.setError(getString(R.string.error_insert_name));
-            Toast.makeText(MainActivity.this, getString(R.string.error_insert_name), Toast.LENGTH_LONG).show();
-        }
-    }
 }
\ No newline at end of file
diff --git a/app/src/main/res/drawable/happy_birthday.PNG b/app/src/main/res/drawable/happy_birthday.PNG
new file mode 100644
index 0000000..050f0de
Binary files /dev/null and b/app/src/main/res/drawable/happy_birthday.PNG differ
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 39bb5da..af785ca 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,98 +1,38 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:orientation="vertical"
     tools:context=".MainActivity">
 
     <TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_gravity="bottom"
-        android:layout_margin="@dimen/medium_space"
-        android:background="@android:color/holo_green_light"
-        android:gravity="center_horizontal"
-        android:padding="@dimen/medium_space"
-        android:text="@string/this_is_my_first_textview"
-        android:textColor="@color/purple_700"
-        android:textSize="@dimen/medium_text"
-        android:textStyle="italic|bold" />
+        android:text="@string/happy_birthday"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
 
-    <ImageView
-        android:layout_width="120dp"
-        android:layout_height="120dp"
-        android:scaleType="fitCenter"
-        android:src="@drawable/android_logo" />
-
-    <Button
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="@string/i_am_a_button" />
-
-    <View
-        android:layout_width="match_parent"
-        android:layout_height="3dp"
-        android:background="@color/purple_200" />
-
-    <EditText
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:hint="@string/write_your_name_here"
-        android:inputType="textCapWords"
-        android:textColor="@color/purple_700" />
-
-    <CheckBox
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:checked="true"
-        android:text="@string/i_accept_terms_and_conditions" />
-
-    <RadioGroup
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content">
-
-        <RadioButton
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:text="@string/yes" />
-
-        <RadioButton
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:checked="true"
-            android:text="@string/no" />
-    </RadioGroup>
-
-    <RatingBar
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:isIndicator="false"
-        android:numStars="5"
-        android:rating="3.5"
-        android:stepSize="0.5" />
-
-    <ProgressBar
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:visibility="gone" />
-
-    <Switch
+    <TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="@string/change_color" />
-
-    <SeekBar
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginTop="@dimen/medium_space"
-        android:max="100"
-        android:progress="70" />
+        android:text="@string/android"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintHorizontal_bias="0.498"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.445" />
 
-    <SearchView
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:queryHint="@string/search_for_android" />
-
-</LinearLayout>
\ No newline at end of file
+    <ImageView
+        android:id="@+id/imageView"
+        android:layout_width="279dp"
+        android:layout_height="271dp"
+        app:srcCompat="@drawable/happy_birthday"
+        tools:layout_editor_absoluteX="66dp"
+        tools:layout_editor_absoluteY="392dp"
+        tools:ignore="MissingConstraints" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index b6f4e26..65daadd 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,15 +1,5 @@
 <resources>
-    <string name="app_name">Curs Android Fundamentals</string>
-    <string name="hello_world_from_android">Hello World from Android!</string>
-    <string name="this_is_my_first_textview">This is my first TextView</string>
-    <string name="i_am_a_button">I am a button</string>
-    <string name="write_your_name_here">Write your name here</string>
-    <string name="i_accept_terms_and_conditions">I accept Terms and Conditions</string>
-    <string name="yes">YES</string>
-    <string name="no">NO</string>
-    <string name="change_color">change color</string>
-    <string name="search_for_android">Search for androids</string>
-    <string name="please_add_your_name_here">Please add your name here</string>
-    <string name="greetings">Greetings :)</string>
-    <string name="error_insert_name">Please insert a name</string>
+    <string name="app_name">HelloAndroid</string>
+    <string name="happy_birthday">Happy birthday to whoever sees this!</string>
+    <string name="android">AndroidFundamentals</string>
 </resources>
\ No newline at end of file