fix button colors based on @bb8 feedback!

app/src/main/res/values/colors.xml

@@ -11,4 +11,5 @@
     <color name="colorMenuItem">#000000</color>
     <color name="selectedColor">#67EA94</color>
     <color name="unselectedColor">#212121</color>
+    <color name="buttonColor">#67EA94</color>
 </resources>

app/src/main/res/values/styles.xml

@@ -4,6 +4,7 @@
     <style name="AppTheme" parent="Theme.MaterialComponents.DayNight">
         <!-- Customize your theme here. -->
         <item name="actionBarTheme">@style/MyActionBar</item>
+        <item name="materialButtonStyle">@style/Widget.App.Button</item>
 
         <item name="colorPrimary">@color/colorPrimary</item>
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
@@ -53,6 +54,10 @@
         <item name="cornerSize">50%</item>
     </style>
 
+    <style name="Widget.App.Button" parent="Widget.MaterialComponents.Button">
+        <item name="backgroundTint">@color/buttonColor</item>
+    </style>
+
     <style name="MyThemeOverlay_Toolbar" parent="">
         <item name="background">@color/colorPrimary</item>
         <item name="android:textColorPrimary">@color/colorOnPrimary</item>