<div class="progress"></div>

.progress {
  width:120px;
  height:20px;
  border-radius: 20px;
  background:
   repeating-linear-gradient(135deg,#f03355 0 10px,#ffa516 0 20px) 0/0% no-repeat,
   repeating-linear-gradient(135deg,#ddd 0 10px,#eee 0 20px) 0/100%;
  animation:p 2s infinite;
}
@keyframes p {
    100% {background-size:100%}
}