Improve gallery comment EditText UI

app/src/main/res/layout/scene_gallery_comments.xml

@@ -65,13 +65,16 @@
                 android:layout_weight="1"
                 android:minHeight="56dp"
                 android:maxHeight="112dp"
-                android:gravity="left|top"
+                android:gravity="left|center_vertical"
+                android:background="@null"
+                android:padding="@dimen/keyline_margin"
                 android:inputType="textMultiLine"/>
 
             <ImageView
                 android:id="@+id/send"
                 android:layout_width="56dp"
                 android:layout_height="56dp"
+                android:layout_gravity="bottom"
                 android:padding="16dp"
                 app:srcCompat="@drawable/v_send_dark_x24"/>