Android Programming: Background color not fully covering fragments

So I'm in the middle of creating my first 'real' application in Android. I'm having a problem with my background color as it not stretches the whole background, I'm still having a box-like grey lines around my app. I was kind of worried because on the simulator, it shows it like it should be, but on my emulator(s, i tried multiple to check), it shows the following (see pic 2): Preview: emulator: Layout file: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#d8edc2"> <TextView android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="Contact" android:layout_marginTop="10dp" android:layout_marginLeft="10dp" android:textSize="24dp" android:textStyle="bold" android:textColor="#000" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Name" android:paddingTop="16dp" android:paddingLeft="10dp" /> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:paddingLeft="10dp" android:id="@+id/editTextSenderName" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Email" android:paddingLeft="10dp" android:paddingTop="16dp"/> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/editTextSenderEmail" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:paddingLeft="10dp" android:text="Subject" android:paddingTop="16dp"/> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/editTextSenderSubject" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Message" android:paddingLeft="10dp" android:paddingTop="16dp"/> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:inputType="textMultiLine" android:lines="5" android:id="@+id/editTextSenderMessage" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Send message" android:paddingTop="10dp" android:id="@+id/buttonSendMessage" /> </LinearLayout> What could be the problem?