(TM) website performance - fixing js+html+css errors

1) https://www.transfermilan.com/speed/page1.html 

adapt the website page so that it passes the PageSpeed Insights check

Core Web Vitals Assessment - Passed

i.e. so that all metrics are in the green zone

- Largest Contentful Paint (LCP)

- Interaction to Next Paint (INP)

- Cumulative Layout Shift (CLS)

- First Contentful Paint (FCP)

- Time to First Byte (TTFB)

Provide a detailed instruction on what specific changes were made to the page and how.

highlight the lines of code that were changed.

2) https://www.transfermilan.com/speed/page1.html 

After loading the page, after a few seconds the entire page disappears for a second and then reappears.

The page flickers. At the same time, the page itself does not reload. 

It is necessary to find out what the problem is in the code and fix it.

Provide a detailed instruction on what specific changes were made to the page and how.

highlight the lines of code that were changed.    

3) 

In the mobile version (when opening the site on mobile).

After entering the city (for example: Milan) in the "Departure point:" field

in the dropdown list, if the client clicks on the word "Milan", the value "EXPO 2015 MILAN, Italy" is entered in the field.

i.e. there is a shift of the list relative to the selection field.

This needs to be fixed.

Provide a detailed instruction on what specific changes were made to the page and how.

highlight the lines of code that were changed.    

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the video records the problems on the page - task 2, 3