Customizing the search in Mobile only in Magento 2

I tried to customize the Mobile search from label to anchor, but it’s not working.

However, I modified the form.min.phtml and form-min.js file as below but still not working.

<a title="Search" class="label" for="search" data-role="minisearch-anchor" href="javascript::void(0)" >
                    <span ><?php /* @escapeNotVerified */ echo __('Search'); ?></span>
                </a>

and the js file

..
searchLabel: '[data-role=minisearch-anchor]',
..

But not working for me.

Any help on this?