Code pen, no scroll bar?

I’am currently busy attempting the portfolio project for the Html, css and JQuery course and I’am attempting several new methods to design the website. I have 3 different containers on my website for 3 different subjects like about and contact, the page has gotten big enough that it requires a scroll bar however one doesn’t seem to appear. Am I doing something wrong? do I need to add some code to make the scroll bar appear?

My code pen:


ad 1) I removed overflow: auto; from your #about rule from css
ad 2) I add at the bottom of CSS file new rule:

height:300px; // sets height of your content
overflow: auto; // adds scroll-bar where is needed

Hi, thank you for the fix.

When I tried to apply it but it didn’t seem to add a scroll-bar. I still couldn’t view my portfolio section or my contact properly. Is this fix for bootstrap 3 or 4? (I use bootstrap 3 for this one)