It’s possible to wrap all the content parts in divs with different classes so you can style them differently – so you could give them different backgrounds.
The following outputs all the content parts surrounded by divs each with a class ‘content-part-1’, ‘content-part-2’ etc…
<?php
the_content_parts( array(
'before' => '<div class="content-part content-part-%%part%%">',
'after' => '</div>'
) );
?>
Not sure if that’s what you need?
@ben Huson,:Thanks but I a new in this field .I don’t even know where to put these snippet.Please guide me in detail step wise. I want to create page like this with different full width background in Customizr theme.
It would really depending on the theme you are using, but really to achieve something like that you probably need a theme that already works like that, or to build a complete theme yourself, or commission someone to develop one for you.
