// Webkit
@-webkit-keyframes progress-bar-stripes {
  from  { background-position: 0 0; }
  to    { background-position: 40px 0; }
}

// Firefox
@-moz-keyframes progress-bar-stripes {
  from  { background-position: 0 0; }
  to    { background-position: 40px 0; }
}

// Spec
@keyframes progress-bar-stripes {
  from  { background-position: 0 0; }
  to    { background-position: 40px 0; }
}