No Framework: URL shortening API landing page with HTML, CSS and JS

Hello,

This is my first JS challenge, please help review my code and suggest how i can improve my code.

Here is also a important requirement i couldn't implement "User can see a list of their shortened links, even after refreshing the browser". Your suggestion on how i can achieve this are welcome.

Lastly, give suggestion on how i can improve generally on my code.

Thanks