.btn {
  position: fixed;
  z-index: 2;
  bottom: 5%;
  right: 3%;
  display: table;
  width: 3em;
  height: 3em;
  background-color: black;
  color: white;
  border-radius: 50%;
  text-align: center;
  cursor: pointer;
  box-shadow: 0 0 50px 5px gray;
  transition: background-color 0.25s;
}

.btn:hover { background-color: #303030 }

.btn:active { background-color: #505050 }

.icon {
  display: table-cell;
  vertical-align: middle;
  height: 100%;
  font-size: 1.5em;
}

.unreadCountLabel {
  position: absolute;
  top: 0;
  right: 0;
  width: 1.5em;
  height: 1.5em;
  font-size: 0.75em;
  border-radius: 50%;
  background-color: #D71F4B;
  color: white;
  display: table-cell;
  text-align: center;
  vertical-align: middle;
}