Looking for a Wordpress Expert to change some CSS and move a function from "Parent" to "Child Theme"

Hi, We're looking for an experienced Wordpress and Woocommerce expert to change some of the CSS, and move a specific function from "Parent theme" to "Child theme". (This should be done without affecting the site speed) [login to view URL] is an “arrow-down CSS arrow” in the Product pages, which we need it to remain on the page until the “main image section” reaches the bottom. (Currently it disappears in the middle before the image section reaches to the bottom.) (Note: This arrow contains a link to jump to the “Description” part of the product page.) [login to view URL] have some “Image type variations” on the mobile view, which we need it to be “squared shape” and make the image larger. (There are text description below the “image variations”, make the text smaller and adjust the line height) [login to view URL] is a function loaded in the “Parent theme”, which needs to be placed into the “Child Theme”. (Put the JS, Header, Footer under child theme in the right way in order to --------- reduce the HTTP request and avoid theme updates removing this function. ) Following this guide: [login to view URL] Skills required: HTML, CSS, JS, PHP, Wordpress and Woocommerce experience. We'll need to test the function and make sure everything worked as expected before releasing the final payment. The bonus will apply for perfect complement. Thanks and Regards