I created a tribute page - http://codepen.io/raufagayev/pen/ZKGemz. I couldn’t centralize the content of list elements. I’d like to have a feedback about my solution and get some additional insights. Thank you for your time.
You are using bootstrap 4 although you are using bootstrap 3 in your html (some classes are named differently). Here is an example
<img src="http://cdn.c.photoshelter.com/img-get2/I0000ifQaRYqQuX0/fit=1000x750/Soviet-photojournalist-Vasily-Kafo-24.jpg" class=".img-responsive">
Class you are using is ‘.img-responsive’ which is invalid as it has a full stop in it and also in Bootstrap 4 its ‘img-fluid’ instead of ‘img-responsive’ (link)
Overall I like how you have used CSS to as minimal as possible and used bootstrap classes instead.