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gaia/shared/elements/gaia_progress/style.css

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+gaia-progress {
+  display: block;
+  width: 100%;
+  overflow: hidden;
+  height: 0.4rem;
+  border: none;
+  position: relative;
+}
+
+gaia-progress:-moz-dir(rtl) {
+  transform: scaleX(-1);
+}
+
+#progress {
+  height: 0.4rem;
+  /* Since we animate, we need to extend the width to 100% + 1 full animation */
+  width: calc(100% + 15rem);
+  background: #00caf2 repeating-linear-gradient(135deg, #92F4FE, #92F4FE 5rem, #00CDF0 5rem, #00CDF0 10rem);
+  border: none;
+  position: absolute;
+  top: 0;
+  left: 0;
+}
+
+#progress.animated {
+  animation: moving-backward 1.5s steps(15) infinite;
+}