According to CSS property: z-index: Negative values | Can I use... Support tables for HTML5, CSS3, etc, Chrome for Android first gained support for negative z-index values on Sept 11, 2023.
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If you want the field to be dynamic, you will need to use javascript.
The library that I personally use to achieve this is GitHub - twitter/typeahead.js: typeahead.js is a fast and fully-featured autocomplete library but there are many options. The one I use hasn't been updated in nearly a...
You have to redirect to a fully qualified URL. For example:
header("Location: https://www.example.com/error_page.php");
die();
Also, make sure that there are never any echo statements or content outputted to the browser anywhere in your code before this header(). You will get a PHP fatal error...