how to evenly distribute elements in a div next to each other?

Question

This is meant for a menu.
For example I have a div element with 3 spans in it, all of which have some margin, max-width and float (left or right).
It is positioned s

Answer 1

.container {
  padding: 10px;
}
.parent {
  width: 100%;
  background: #7b7b7b;
  display: flex;
  justify-content: space-between;
  height: 4px;
}
.child {
  color: #fff;
  background: green;
  padding: 10px 10px;
  border-radius: 50%;
  position: relative;
  top: -8px;
}