/*effects*/
#scrolltopbtn {
     overflow: hidden;
}
.btn-primary,
.an_productattributes-add-to-cart-btn {
     position: relative;
     overflow: hidden;
}
#scrolltopbtn::before,
.btn-primary::before,
.an_productattributes-add-to-cart-btn::before {
     position: absolute;
     top: 0;
     left: -75%;
     z-index: 2;
     display: block;
     content: '';
     width: 50%;
     height: 100%;
     background: -webkit-linear-gradient(left, rgba(255,255,255,0) 0%, rgba(255,255,255,.3) 100%);
     background: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,.3) 100%);
     -webkit-transform: skewX(-25deg);
     transform: skewX(-25deg);
}
#scrolltopbtn:hover::before {
     -webkit-animation: shine .5s;
     animation: shine .5s;
}
.btn-primary:hover::before,
.an_productattributes-add-to-cart-btn:hover::before {
     -webkit-animation: shine .75s;
     animation: shine .75s;
}

@-webkit-keyframes shine {
     100% {
          left: 125%;
     }
}
@keyframes shine {
     100% {
          left: 125%;
     }
}