How to style input field number up & down button on firefox - html

Question

I am trying to style the up and down button of the input field number on FF. I have successfully achieved this on chrome with the below code but I can't find any CSS trick to do it on FF.
I can't use JS to do this.
Is it possible to style the up and down using CSS in FF? if so how? - I only need to achieve this on the latest version
DOM
<div class="productQty">
<span></span>
<input type="number" max="10" min="1" class="mod"/>
</div>
CSS
input[type="number"] {
height: 30px;
width: 60px;
font-size: 18px;
position: relative;
background-color: transparent;
border: none;
-moz-appearance: textfield;
}
.productQty span {
display: block;
width: 41px;
height: 30px;
background: white;
z-index: -1;
position: absolute;
top: 0;
left: 0;
bottom: 0;
border: solid 1px #999999;
}
/* Spin Buttons modified */
input[type="number"].mod::-webkit-outer-spin-button,
input[type="number"].mod::-webkit-inner-spin-button {
-webkit-appearance: none;
background: transparent url("../img/updown.png") no-repeat center center;
width: 16px;
height: 100%;
opacity: 1; /* shows Spin Buttons per default (Chrome >= 39) */
position: absolute;
top: 0;
right: 0;
bottom: 0;
}
input[type="number"].mod::-moz-inner-spin-button:hover,
input[type="number"].mod::-moz-inner-spin-button:active{
border: none;
}
/* Override browser form filling */
input:-webkit-autofill {
background: black;
color: red;
}
How does it look on chrome and how it should look
How does it looks in FF 38

Answer 1

You can't directly apply css to the buttons on FF, there is a bugreport about it:
https://bugzilla.mozilla.org/show_bug.cgi?id=1108469
If you don't mind to apply some css to the containing element, you could use the :before and :after to overlay custom buttons.
div:before, div:after {
display: block;
position: absolute;
width: 14px;
height: 8px;
line-height: 8px;
background-color: #ccc;
left: 136px;
z-index: 1;
font-size: 9px;
text-align: center;
pointer-events: none;
}
div:before {
content: "+";
top: 11px;
}
div:after {
content: "-";
top: 20px;
}
<div><input type="number" /></div>