.instock_button {
  background-color: green;
  border: 0;
  border-radius: 4px;
  color: #fff;
  cursor: pointer;
  display: inline-block;
  font-size: 16px;
  font-size: 16px;
  text-align: center;
  padding: 12px 20px 14px;
  float: right;
}
@media only screen and (max-width: 575.98px) {
  .instock_button {
    font-size: 14px;
    padding: 10px 18px 12px;
  }
}