cross browser custom checkbox - html

Question

I have HTML and CSS code that I've used to build a custom checkbox. I believe my code has the correct web-kits but it doesn't seem to work on FireFox.
Here's the code:
HTML
<input type='checkbox' style="float: left" class='regular-checkbox big-checkbox'
checked='checked' id='product-45-45' name='product_id_page-0[45-45]'
value='45-45' data-first_price="11.99" data-second_price="" data-paysys="" />
CSS
.regular-checkbox {
-webkit-appearance: none;
-moz-appearance: none;
background-color: #fafafa;
border: 1px solid #cacece;
box-shadow: 0 1px 2px rgba(0,0,0,0),inset 0 -15px 10px -12px rgba(0,0,0,0);
-moz-box-shadow: 0 1px 2px rgba(0,0,0,0),inset 0 -15px 10px -12px rgba(0,0,0,0);
-webkit-box-shadow: 0 1px 2px rgba(0,0,0,0),inset 0 -15px 10px -12px rgba(0,0,0,0);
padding: 9px;
border-radius: 20px;
-moz-border-radius: 20px;
-webkit-border-radius: 20px;
display: inline-block;
position: relative;
}
.regular-checkbox:active,
.regular-checkbox:checked:active {
box-shadow: 0 1px 2px rgba(0,0,0,0),inset 0 1px 3px rgba(0,0,0,0);
-moz-box-shadow: 0 1px 2px rgba(0,0,0,0),inset 0 1px 3px rgba(0,0,0,0);
-webkit-box-shadow: 0 1px 2px rgba(0,0,0,0),inset 0 1px 3px rgba(0,0,0,0);
}
.regular-checkbox:checked {
background-color: #e9ecee;
box-shadow: 0 1px 2px rgba(0,0,0,0),inset 0 -15px 10px -12px rgba(0,0,0,0),inset 15px 10px -12px rgba(255,0,0,0);
-moz-box-shadow: 0 1px 2px rgba(0,0,0,0),inset 0 -15px 10px -12px rgba(0,0,0,0),inset 15px 10px -12px rgba(255,0,0,0);
-webkit-box-shadow: 0 1px 2px rgba(0,0,0,0),inset 0 -15px 10px -12px rgba(0,0,0,0),inset 15px 10px -12px rgba(255,0,0,0);
}
.regular-checkbox:checked:after {
content: '\2714';
font-size: 14px;
position: absolute;
top: 0;
left: 3px;
color: #19a73e;
}
.big-checkbox {
padding: 18px;
}
.big-checkbox:checked:after {
font-size: 37px;
top: -7px;
left: 2px;
}
Screen shot of the desired outcome (works in Chrome):

Answer 1

Try use this code, I don't know explain, but I did one version for you ;)
.regular-checkbox{
display: inline-block;
border-radius: 50%;
width: 38px;
height: 38px;
border: 1px solid #ccc;
}
.regular-checkbox input{
opacity: 0;
position: absolute;
}
.regular-checkbox small{
width: 100%;
height: 100%;
float: left;
}
.regular-checkbox input:checked ~ small:after{
content: '\2714';
height: 38px;
width: 38px;
color: green;
font-size: 26px;
text-align: center;
float: left;
}
<label class="regular-checkbox">
<input type="checkbox">
<small></small>
</label>

Answer 2

This is a known issue in Firefox - there's a workaround with using <label> and <span>.
MDN also mentions that styling some form elements is a bit of a pain - read more here.
.checkbox input[type="checkbox"] {
display: none;
}
.checkbox span {
background-color: #fafafa;
border: 1px solid #cacece;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0), inset 0 -15px 10px -12px rgba(0, 0, 0, 0);
padding: 22px;
-webkit-border-radius: 50%;
border-radius: 50%;
display: inline-block;
position: relative;
}
.checkbox :active + span,
.checkbox :checked:active span {
box-shadow: 0 1px 2px rgba(0, 0, 0, 0), inset 0 1px 3px rgba(0, 0, 0, 0);
}
.checkbox :checked + span {
background-color: #e9ecee;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0), inset 0 -15px 10px -12px rgba(0, 0, 0, 0), inset 15px 10px -12px rgba(255, 0, 0, 0);
}
.checkbox :checked + span:after {
content: '\2714';
font-size: 14px;
position: absolute;
top: 0;
left: 0px;
width: 100%;
color: #19a73e;
text-align: center;
}
.big-checkbox {
padding: 18px;
}
.big-checkbox:checked + span:after {
font-size: 37px;
}
<label class="checkbox" for="product-45-45">
<input type='checkbox' style="float: left" class='regular-checkbox big-checkbox' checked='checked' id='product-45-45' name='product_id_page-0[45-45]' value='45-45' data-first_price="11.99" data-second_price="" data-paysys="" />
<span></span>
</label>