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.quantity input[type=number]::-webkit-inner-spin-button,
.quantity input[type=number]::-webkit-outer-spin-button
{
  -webkit-appearance: none;
  margin: 0;
}
.quantity input[type=number]
{
  -moz-appearance: textfield;
}
.quantity input {
  width: 70px;
  height: 42px;
  line-height: 1.65;
  float: left;
  display: block;
  text-align: center;
  padding: 0;
  margin: 0;
  padding-left: 10px;
  padding-right: 25px;
  border: 1px solid #999;
  font-size: 16px;
  font-family: 'Poppins', sans-serif;
}
.quantity input:focus {
  outline: 0;
}
.quantity-nav {
  float: left;
  position: relative;
  height: 42px;
}
.quantity-button {
  position: relative;
  cursor: pointer;
  border-left: 1px solid #999;
  width: 20px;
  text-align: center;
  color: #333;
  font-size: 18px;
  line-height: 1.33;
  -webkit-transform: translateX(-100%);
  transform: translateX(-100%);
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -o-user-select: none;
  user-select: none;
}
.quantity-button.quantity-up {
  position: absolute;
  height: 50%;
  top: 0;
  border-bottom: 1px solid #999;
}
.quantity-button.quantity-down {
  position: absolute;
  bottom: -1px;
  height: 50%;
}

jQuery('
+
-
').insertAfter('.quantity input');
  jQuery('.quantity').each(function() {
    var spinner = jQuery(this),
      input = spinner.find('input[type="number"]'),
      btnUp = spinner.find('.quantity-up'),
      btnDown = spinner.find('.quantity-down'),
      min = input.attr('min'),
      max = input.attr('max');
    btnUp.click(function() {
      var oldValue = parseFloat(input.val());
      if (oldValue >= max) {
        var newVal = oldValue;
      } else {
        var newVal = oldValue + 1;
      }
      spinner.find("input").val(newVal);
      spinner.find("input").trigger("change");
    });
    btnDown.click(function() {
      var oldValue = parseFloat(input.val());
      if (oldValue <= min) {
        var newVal = oldValue;
      } else {
        var newVal = oldValue - 1;
      }
      spinner.find("input").val(newVal);
      spinner.find("input").trigger("change");
  });
});