body {
  font-size: 0.8125em;
}

.sidebar a {
  position: relative;
  display: block;
}

.sidebar a .active-pointer {
  display: none;
}

.sidebar a.active .active-pointer {
  display: inline-block;
  position: absolute;
  border-bottom: 10px solid transparent;
  border-right: 10px solid #45378e;
  border-top: 10px solid transparent;
  height: 0;
  width: 0;
  right: 0;
}