.HolyGrail {
  display: flex;
  flex-direction: column;
}

.HolyGrail-body {
  display: flex;
  flex-direction: column;
  padding: 1.5em;
}

.HolyGrail-content {
  margin: 1.5em 0;
}

.HolyGrail-nav {
  order: -1;
}

.HolyGrail-nav, .HolyGrail-ads {
  padding: 1em;
  border-radius: 3px;
  background: hsla(31, 15%, 50%, 0.1);
}

@media (min-width: 768px) {
  .HolyGrail-body {
    flex-direction: row;
    flex: 1;
  }
  .HolyGrail-content {
    flex: 1;
    padding: 0 1.5em;
    margin: 0;
  }
  .HolyGrail-nav, .HolyGrail-ads {
    flex: 0 0 12em;
  }
}

.HolyGrail {
  display: flex;
  flex-direction: column;
}

.HolyGrail-body {
  display: flex;
  flex-direction: column;
  padding: 1.5em;
}

.HolyGrail-content {
  margin: 1.5em 0;
}

.HolyGrail-nav {
  order: -1;
}

.HolyGrail-nav, .HolyGrail-ads {
  padding: 1em;
  border-radius: 3px;
  background: hsla(31, 15%, 50%, 0.1);
}

@include breakpoint("large") {
  .HolyGrail-body {
    flex-direction: row;
    flex: 1;
  }
  .HolyGrail-content {
    flex: 1;
    padding: 0 1.5em;
    margin: 0;
  }
  .HolyGrail-nav, .HolyGrail-ads {
    flex: 0 0 12em;
  }
}

Update the holy grail component to use the breakpoint mixin.
Update the holy grail component to use the breakpoint mixin.
