Active buttons not working

[BellaSzabo]

I have copy and pasted the coding from https://www.w3schools.com/howto/howto_js_portfolio_filter.asp into my portfolio page and came across some issues that I cannot figure out. 

1. When I open my html document in the web browser, it doesn't show all of the photos until you click on "All" in the portfolio's menu bar. It's supposed to show all right when you open the portfolio page.

2. The active link is not working right. It shows "All" as being active even when you click on the other options. 

Anyone know how to fix this? I am not familiar with js so I don't know how to fix these problems. 

art.css portfolio.js portfolio.html