.btn-wrap {
  display: inline-block;
  position: relative;
  /* no select */
  -webkit-touch-callout: none;
  /* iOS Safari */
  -webkit-user-select: none;
  /* Safari */
  -khtml-user-select: none;
  /* Konqueror HTML */
  -moz-user-select: none;
  /* Firefox */
  -ms-user-select: none;
  /* Internet Explorer/Edge */
  user-select: none;
  /* Non-prefixed version, currently */
}
.btn-wrap .btn-progress {
  display: none;
  position: absolute;
  z-index: 1;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  /* stripped */
  background-image: -webkit-gradient(linear, 0 100%, 100% 0, color-stop(0.25, rgba(255, 255, 255, 0.35)), color-stop(0.25, transparent), color-stop(0.5, transparent), color-stop(0.5, rgba(255, 255, 255, 0.35)), color-stop(0.75, rgba(255, 255, 255, 0.35)), color-stop(0.75, transparent), to(transparent));
  background-image: -webkit-linear-gradient(-45deg, rgba(255, 255, 255, 0.35) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.35) 50%, rgba(255, 255, 255, 0.35) 75%, transparent 75%, transparent);
  background-image: -moz-linear-gradient(-45deg, rgba(255, 255, 255, 0.35) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.35) 50%, rgba(255, 255, 255, 0.35) 75%, transparent 75%, transparent);
  background-image: -ms-linear-gradient(-45deg, rgba(255, 255, 255, 0.35) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.35) 50%, rgba(255, 255, 255, 0.35) 75%, transparent 75%, transparent);
  background-image: -o-linear-gradient(-45deg, rgba(255, 255, 255, 0.35) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.35) 50%, rgba(255, 255, 255, 0.35) 75%, transparent 75%, transparent);
  background-image: linear-gradient(-45deg, rgba(255, 255, 255, 0.35) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.35) 50%, rgba(255, 255, 255, 0.35) 75%, transparent 75%, transparent);
  -webkit-background-size: 40px 40px;
  -moz-background-size: 40px 40px;
  -o-background-size: 40px 40px;
  background-size: 40px 40px;
  /* progress animation */
  -webkit-animation: progress-bar-stripes 2s linear infinite;
  -moz-animation: progress-bar-stripes 2s linear infinite;
  animation: progress-bar-stripes 2s linear infinite;
}
.btn-wrap .btn-progress.active {
  display: block;
}