/*effects*/
.btn-primary,
.an_productattributes-add-to-cart-btn {
    position: relative;
    z-index: 2;
    transition: color .3s;
}

.btn-primary::before,
.an_productattributes-add-to-cart-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 0;
    z-index: -1;
    -webkit-transition: box-shadow 0.3s;
    transition: box-shadow 0.3s;
}