create mockup page with pagination
get the total number of countries in the database
retrieve a row fo 40 countries from database
define variables used in pagination
prepare to disable previous button when i am on the first page and next button when i am on the last page
pagination button has active class only when current_page has the same value as loop index
transmit page in url
make sure page number extracetd from request is integer value
get sure that we don't exceed the total numbers of countries
pagination works
display details of the countries in the page
making functional previous and next buttons