Portfolio task completed

Just finished my build a portfolio page task and would like some feedback.
Also I have trouble getting the page responsive for mobile phones, can anyone help me with where I,m going wrong?.

Here’s a link: https://codepen.io/Spaarwiel/full/rGVZpa/

Just quickly looking I notice you only specify the spacing for XS size col-xs-4.
Is this what you want for other view port sizes?
My portfolio specifies a lot more changes depending on your screen view size:

That’s how I understood it, xs for the extra small screen like phones.
I see now you make the container-fluid class for every div, I thought it’s only needed once at the top.
Will play around a bit and try and fix it.