buttons.xml

<resources>
    <style name="Button.Flat" parent="Widget.AppCompat.Button">
        <item name="android:textColor">@color/colorAccent</item>
        <item name="android:background">@drawable/bg_button_state</item>
    </style>

    <style name="Button.Colored" parent="Widget.AppCompat.Button.Colored">
        <item name="android:background">@drawable/bg_button_solid</item>
        <item name="android:textColor">#727272</item>
    </style>

    <style name="Button.Borderless" parent="Widget.AppCompat.Button.Borderless">
        <item name="android:background">@drawable/bg_button_stroke</item>
        <item name="android:textColor">#ffffff</item>
        <item name="android:textSize">22sp</item>
    </style>

    <style name="Button.Borderless.Colored" parent="Widget.AppCompat.Button.Borderless.Colored">
        <item name="android:background">@drawable/bg_button_stroke</item>
        <item name="android:textColor">#ffffff</item>
        <item name="android:textSize">22sp</item>
    </style>

    <style name="PrimaryFlatButton" parent="Theme.AppCompat.Light">
        <item name="android:buttonStyle">@style/Widget.AppCompat.Button.Borderless.Colored</item>
        <item name="colorControlHighlight">@color/colorAccent</item>
        <item name="colorAccent">@color/colorPrimary</item>
    </style>

    <style name="PrimaryButton" parent="Theme.AppCompat">
        <item name="colorButtonNormal">@color/colorPrimary</item>
        <item name="colorControlHighlight">@color/colorAccent</item>
    </style>

</resources>