Positioning triangles inside an element with CSS pseudo elements

triangles.css

.pill {
  position: relative;
}
.pill::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 100%;
  margin-top: -5px;
  width: 0;
  height: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-right: 5px solid black;
  margin-left: 10px;
}
.pill::after {
  content: '';
  position: absolute;
  top: 50%;
  right: 0;
  margin-top: -5px;
  width: 0;
  height: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 5px solid black;
  margin-right: 10px;
}