message: Coin: change frame
diff: .coin {
  @include square-block;
  background-color: #47454a;
  - border: 1px solid #fff;
  + //border: 1px solid #ddd;
  + box-shadow: 0px 0px 5px -1px #888;
  position: relative;
  border-radius: 50%;
  }
  