DatePicker widget does not show white background.

[santosh-pingle]

Describe the bug
Questionnaire theme inherits material3 theme.
It shows blue container background in date picker widget.

Component
SDC library, reference app

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
It should show white background.

Screenshots

Smartphone (please complete the following information):

• Device: [e.g. Pixel4a emulator]
• Android version: [e.g. Settings -> About phone -> Android version]
• Build number: [e.g. Settings -> About phone -> Build number]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

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Please state if this issue should be assigned to you or who you think could help to solve this issue.

[santosh-pingle]

With below change date picker container background color become white, but selected and current date does not show style.

<style
        name="ThemeOverlay.Questionnaire.DatePicker"
        parent="@style/ThemeOverlay.Material3.MaterialCalendar"
    >
        <item name="colorPrimary">?attr/colorSurface</item>
        <item name="colorOnPrimary">?attr/colorOnSurface</item>
</style>

so, this approach can not be used to make background white, because colorPrimary and colorOnPrimary are used to show current and selected date as well.

[santosh-pingle]

With below change it shows date picker white background but overlaps the title "select date".

<style
        name="ThemeOverlay.Questionnaire.DatePicker"
        parent="@style/ThemeOverlay.Material3.MaterialCalendar"
    >
        <item name="android:background">?attr/colorSurface</item>
</style>

So, can not apply this change.

[santosh-pingle]

It looks like dialog container color get applied as primaryColor value.
There is no style for dialog container which can be overridden for container color.
e.g Widget.Material3.MaterialCalendar.HeaderLayout can be used to override header background color.

[santosh-pingle]

Default datepicker material3 shows below visual.
ThemeOverlay.Material3.MaterialCalendar

[santosh-pingle]

@shelaghm