activity_main.xml

<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:fitsSystemWindows="true"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context=".MainActivity"
    android:background="@color/colorPrimary">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="56dp"
        android:paddingLeft="24dp"
        android:paddingRight="24dp">

        <ImageView android:src="@drawable/selfie"
            android:layout_width="wrap_content"
            android:layout_height="72dp"
            android:layout_marginBottom="24dp"
            android:layout_gravity="center_horizontal" />

            <!-- Login Label -->
            <android.support.design.widget.TextInputLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:layout_marginBottom="8dp">
                <EditText android:id="@+id/login_et"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="Email" />
            </android.support.design.widget.TextInputLayout>

            <!-- Password Label -->
            <android.support.design.widget.TextInputLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:layout_marginBottom="8dp">
                <EditText android:id="@+id/password_et"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:inputType="text|textVisiblePassword"
                    android:hint="Password"/>
            </android.support.design.widget.TextInputLayout>

            <android.support.v7.widget.AppCompatButton
                android:id="@+id/login_bt"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="24dp"
                android:layout_marginBottom="24dp"
                android:padding="12dp"
                android:text="Login"/>
        </LinearLayout>
</ScrollView>