Go to w4 post list page, and create a new list. Set these values –
List Type > Post Type: Posts
List Type > Preset: Custom
Posts > Post type: Posts (check)
Posts > Post status: Publish
Posts > Items per page: -1
Template:
<select>[posts]
<option value=[post_permalink]>[post_title]</option>
[/posts]</select>
Save it. Then use the shortcode or Post list widget to display this on frontend.
The background is grey only in android.