I added some icons on 4 buttons and they look so big next to the button. So how can I resize them? I used drawableLeft on the buttons to add icons.

The drawables are called deal, trophy, puzzle and megaphone. The icons are too big. The content_main.xml file:

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="@+id/content_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="tr.k12.evrim.evrimnews.MainActivity"
    tools:showIn="@layout/activity_main">




    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/frameLayout"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true">


        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <Button
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Giriş Yap"
                android:onClick="SignIn"
                android:textStyle="bold"
                style="@style/Widget.AppCompat.Button.Colored"/>




            </LinearLayout>


    </FrameLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="400dp"
        android:layout_below="@id/frameLayout"
        android:orientation="vertical">



    <Button
        android:text="Duyurular"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:layout_below="@+id/frameLayout"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="13dp"
        android:id="@+id/button2"
        android:drawableLeft="@drawable/megaphone" />

    <Button
        android:text="Kadromuz"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:layout_below="@+id/button2"
        android:layout_alignEnd="@+id/button2"
        android:layout_marginTop="13dp"
        android:id="@+id/button3"
        android:drawableLeft="@drawable/puzzle"/>

        <Button
            android:text="Başarılarımız"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:layout_marginTop="12dp"
            android:id="@+id/button5"
            android:drawableLeft="@drawable/trophy"/>


    <Button
        android:text="Ortaklarımız"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:layout_marginTop="12dp"
        android:id="@+id/button4"
        android:drawableLeft="@drawable/deal"/>




    </LinearLayout>

</RelativeLayout>