How to add a smooth scroll transition

Question

How do i make when i click home, contacts etc. to smoothly move to where its told to, not instantly.
https://code.sololearn.com/WVHsB91LJJJF/?ref=app

Answer 1

https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Transitions/Using_CSS_transitions

https://css-tricks.com/almanac/properties/t/transition/

Look through these two and you'll probably find your answer. The second site, css-tricks, is an awesome site to review when dealing with anything CSS. Good luck.