.button-float {
  border: none;
  padding: 15px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  border-radius: 50%;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.5), 0 8px 20px 0 rgba(0, 0, 0, 0.25);
}