优化单选框、复选框的样式

<p class="check-wrappers">
    <span class="c-checkbox checked">
        <input type="radio" autocomplete="off" name="type" style="display:none;" value="1" checked="checked">
    </span>
    <span></span>
</p>

.cart-checkbox.checked {
    background-position: -29px 0;
}
.c-checkbox {
    display: block;
    width: 25px;
    height: 25px;
    margin: 0 auto;
    background: url(/shop-cart.png) no-repeat 0 0;
    background-size: 60px 120px;
}