Guys check my tribute page its on my fav theoratical physicist.
thankyou
You could add img-fluid w-100 to your img class instead of the center class. This will fill up the image nicely in the container and get rid of most of the whitespace.
Also if you want the whitespace in the caption like the example you could try to nest the text inside the div of the thumbnail.
omg thank u so much i ll do all this