How to center a (background) image within a div?

Question

Is it possible to center a background image in a div? I have tried just about everything - but no success:

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Answer 1

This works for me:

.network-connections-icon {
  background-image: url(url);
  background-size: 100%;
  width: 56px;
  height: 56px;
  margin: 0 auto;
}