Color combination for my Button(Android) : <p>My LinearLayout has this image for background:
<a href="https://i.stack.imgur.com/N9px7.png" rel="nofollow noreferrer">Background image</a></p>

<p>I have this drawable:</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" &gt;
    &lt;corners
        android:radius="14dp"
        /&gt;
    &lt;gradient
        android:angle="45"
        android:centerX="35%"
        android:centerColor="COLOR1"
        android:startColor="COLOR2"
        android:endColor="COLOR3"
        android:type="linear"
        /&gt;
    &lt;padding
        android:left="0dp"
        android:top="0dp"
        android:right="0dp"
        android:bottom="0dp"
        /&gt;
    &lt;size
        android:width="270dp"
        android:height="60dp"
        /&gt;
    &lt;stroke
        android:width="3dp"
        android:color="#878787"
        /&gt;
&lt;/shape&gt;
</code></pre>

<p>Instead of COLOR1, COLOR2, color3 what colors I could use to the best possible contrast with the colors of the background.</p>
