.hover-flash,
.bns-hover-flash {
  overflow: hidden;
}

.hover-flash:before,
.bns-hover-flash:before {
  position: absolute;
  top: 0;
  left: -85%;
  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, 0.3) 100%);
  background: linear-gradient(to right, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.3) 100%);
  -webkit-transform: skewX(-25deg);
  transform: skewX(-25deg);
}

.hover-flash:hover:before,
.bns-hover-flash:hover:before {
  -webkit-animation: flashshine 0.5s;
  animation: flashshine 0.5s;
}

@keyframes flashshine {
  100% {
    left: 125%;
  }
}