session-desktop/stylesheets/progress.scss

@keyframes progress-bar-stripes {
  from {
    background-position: 40px 0;
  }
  to {
    background-position: 0 0;
  }
}
.progress-bar-striped {
  background-image: -webkit-linear-gradient(45deg, rgba(255, 255, 255, .75) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .75) 50%, rgba(255, 255, 255, .75) 75%, transparent 75%, transparent);
  background-image:      -o-linear-gradient(45deg, rgba(255, 255, 255, .75) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .75) 50%, rgba(255, 255, 255, .75) 75%, transparent 75%, transparent);
  background-image:         linear-gradient(45deg, rgba(255, 255, 255, .75) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .75) 50%, rgba(255, 255, 255, .75) 75%, transparent 75%, transparent);
  -webkit-background-size: 40px 40px;
          background-size: 40px 40px;
}
.progress-bar-striped {
  background-image: -webkit-linear-gradient(45deg, rgba(255, 255, 255, .75) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .75) 50%, rgba(255, 255, 255, .75) 75%, transparent 75%, transparent);
  background-image:      -o-linear-gradient(45deg, rgba(255, 255, 255, .75) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .75) 50%, rgba(255, 255, 255, .75) 75%, transparent 75%, transparent);
  background-image:         linear-gradient(45deg, rgba(255, 255, 255, .75) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .75) 50%, rgba(255, 255, 255, .75) 75%, transparent 75%, transparent);
}
.progress-bar.active {
  -webkit-animation: progress-bar-stripes 2s linear infinite;
       -o-animation: progress-bar-stripes 2s linear infinite;
          animation: progress-bar-stripes 2s linear infinite;
}

.bar-container {
  background: $blue_l;

  .progress-bar {
    height: 100%;
  }
}