Looking to update the appearance of the carousel icons in Bootstrap 4? How about changing them from simple arrows to arrows with dark semi-opaque circles underneath?
If you're wondering how to achieve this modification, keep in mind that the icons are SVGs and tweaking them may require some know-how.
Below is the snippet of Bootstrap code responsible for generating the SVG:
.carousel-control-next-icon {
background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='%23fff' width='8' height='8' viewBox='0 0 8 8'%3e%3cpath d='M2.75 0l-1.5 1.5L3.75 4l-2.5 2.5L2.75 8l4-4-4-4z'/%3e%3c/svg%3e");
}