I have a Bootstrap 4 slider in progress at https://filathlos.imagewize.com/ . When I add images of a 0.75 ratio like 2000x1500 they display and resize well. 3000x2000 works too. This with them being loaded with:
the_post_thumbnail('post-thumbnail', ['class' => 'img-responsive responsive--full', 'title' => 'Feature image']);
It seems to show the images the way I cropped them in WordPress or not and then load them with file dimensions that vary from image to image.
When I use
add_image_size( 'b4-slider', 2000, 1500); or
add_image_size( 'b4-slider', 2000, 1500, true); because I am like, let's automate setting the proper size for these babies.. they are no longer responsive. They get squashed when I shrink the browser window size.
How is this possible?