Fix scroll issue

res/layout/activity_account_details.xml

@@ -45,6 +45,7 @@
             android:layout_width="match_parent"
             android:layout_height="50dp"
             android:layout_marginTop="20dp"
+            android:layout_marginBottom="40dp"
             android:layout_gravity="center_horizontal"
             android:background="@color/signal_primary"
             android:textColor="@color/white"

res/layout/activity_key_pair.xml

@@ -91,6 +91,7 @@
             android:layout_width="match_parent"
             android:layout_height="50dp"
             android:layout_marginTop="20dp"
+            android:layout_marginBottom="40dp"
             android:layout_gravity="center_horizontal"
             android:background="@color/signal_primary"
             android:textColor="@color/white"

res/layout/activity_new_conversation.xml

@@ -1,7 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
+<ScrollView
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:fillViewport="true">
+
+    <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:layout_marginStart="32dp"
@@ -28,6 +33,7 @@
             android:layout_width="match_parent"
             android:layout_height="50dp"
             android:layout_marginTop="24dp"
+            android:layout_marginBottom="32dp"
             android:layout_gravity="center_horizontal"
             android:background="@color/signal_primary"
             android:textColor="@color/white"
@@ -38,3 +44,5 @@
             app:cpb_textIdle="@string/activity_new_conversation_button_title" />
 
     </LinearLayout>
+
+</ScrollView>