Adding nprogress css file to customize

src/styles/nprogress.css

@@ -0,0 +1,74 @@
+/* Make clicks pass-through */
+#nprogress {
+  pointer-events: none;
+}
+
+#nprogress .bar {
+  background: rgba(0, 0, 0, 0.5);
+
+  position: fixed;
+  z-index: 1031;
+  top: 0;
+  left: 0;
+
+  width: 100%;
+  height: 2px;
+}
+
+/* Fancy blur effect */
+#nprogress .peg {
+  display: block;
+  position: absolute;
+  right: 0px;
+  width: 100px;
+  height: 100%;
+  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5), 0 0 5px rgba(0, 0, 0, 0.5);
+  opacity: 1.0;
+
+  -webkit-transform: rotate(3deg) translate(0px, -4px);
+      -ms-transform: rotate(3deg) translate(0px, -4px);
+          transform: rotate(3deg) translate(0px, -4px);
+}
+
+/* Remove these to get rid of the spinner */
+#nprogress .spinner {
+  display: block;
+  position: fixed;
+  z-index: 1031;
+  top: 15px;
+  right: 15px;
+}
+
+#nprogress .spinner-icon {
+  width: 18px;
+  height: 18px;
+  box-sizing: border-box;
+
+  border: solid 2px transparent;
+  border-top-color: rgba(0, 0, 0, 0.5);
+  border-left-color: rgba(0, 0, 0, 0.5);
+  border-radius: 50%;
+
+  -webkit-animation: nprogress-spinner 400ms linear infinite;
+          animation: nprogress-spinner 400ms linear infinite;
+}
+
+.nprogress-custom-parent {
+  overflow: hidden;
+  position: relative;
+}
+
+.nprogress-custom-parent #nprogress .spinner,
+.nprogress-custom-parent #nprogress .bar {
+  position: absolute;
+}
+
+@-webkit-keyframes nprogress-spinner {
+  0%   { -webkit-transform: rotate(0deg); }
+  100% { -webkit-transform: rotate(360deg); }
+}
+@keyframes nprogress-spinner {
+  0%   { transform: rotate(0deg); }
+  100% { transform: rotate(360deg); }
+}
+

src/styles/reachjs.scss

@@ -1,5 +1,6 @@
 @import url('https://fonts.googleapis.com/css?family=Muli');
 @import './style-scroll.scss';
+@import './nprogress.css';
 
 html, body, input, textarea, select, button {
   font-family: 'Muli', sans-serif !important;
@@ -106,3 +107,12 @@ h1, h2, h3, h4, h5, h6 {
     cursor: pointer;
   }
 }
+
+#nprogress-container {
+  width: 100%;
+  height: 2px;
+  position: absolute;
+  right: 0;
+  top: 0;
+  z-index: 0;
+}