.progress-bar{background-image:linear-gradient(45deg,rgba(255,255,255,.15) 25%,transparent 25%,transparent 50%,rgba(255,255,255,.15) 50%,rgba(255,255,255,.15) 75%,transparent 75%,transparent);background-size:20px 20px;animation:move-stripes 1s linear infinite;transition:width .3s ease-out}@keyframes move-stripes{0%{background-position:0 0}to{background-position:20px 0}}