adding a nicer circular background to buttons

app/src/main/kotlin/com/simplemobiletools/calculator/activities/MainActivity.kt

@@ -93,6 +93,11 @@ class MainActivity : SimpleActivity(), Calculator {
         val properPrimaryColor = getProperPrimaryColor()
         arrayOf(btn_percent, btn_power, btn_root, btn_clear, btn_reset, btn_divide, btn_multiply, btn_plus, btn_minus, btn_equals, btn_decimal).forEach {
             it.setTextColor(properPrimaryColor)
+            it.background?.alpha = 200
+        }
+
+        arrayOf(btn_0, btn_1, btn_2, btn_3, btn_4, btn_5, btn_6, btn_7, btn_8, btn_9).forEach {
+            it.background?.alpha = 80
         }
     }
 

app/src/main/res/drawable/button_circular_background.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ripple xmlns:android="http://schemas.android.com/apk/res/android"
+    android:color="?attr/colorPrimaryDark">
+    <item android:id="@+id/button_circular_background_holder">
+        <layer-list>
+            <item android:id="@+id/button_circular_background_shape">
+                <shape android:shape="oval">
+                    <solid android:color="@color/divider_grey" />
+                </shape>
+            </item>
+        </layer-list>
+    </item>
+</ripple>

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

@@ -4,7 +4,7 @@
     <dimen name="min_widget_width">180dp</dimen>
     <dimen name="min_widget_height">180dp</dimen>
 
-    <dimen name="button_text_size">28sp</dimen>
+    <dimen name="button_text_size">34sp</dimen>
     <dimen name="formula_text_size">20sp</dimen>
     <dimen name="display_text_size">40sp</dimen>
 </resources>

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

@@ -3,11 +3,12 @@
     <style name="AppTheme" parent="AppTheme.Base" />
 
     <style name="MyButton" parent="ShapeAppearanceOverlay.Material3.Button">
-        <item name="android:background">?android:attr/selectableItemBackgroundBorderless</item>
+        <item name="android:background">@drawable/button_circular_background</item>
         <item name="android:textSize">@dimen/button_text_size</item>
         <item name="android:fontFamily">sans-serif-light</item>
         <item name="android:textAllCaps">false</item>
         <item name="android:padding">0dp</item>
+        <item name="android:layout_margin">@dimen/medium_margin</item>
     </style>
 
 </resources>