Feature ready.

src/main/resources/static/pdfjs/images/loading-dark.svg

@@ -0,0 +1,39 @@
+<svg xmlns="http://www.w3.org/2000/svg" height="16" width="16"
+     fill="rgba(255,255,255,1)" style="animation:spinLoadingIcon 1s steps(12,end)
+infinite">
+    <style>@keyframes
+        spinLoadingIcon{to{transform:rotate(360deg)}}
+    </style>
+    <path
+            d="M7 3V1s0-1 1-1 1 1 1 1v2s0 1-1 1-1-1-1-1z"/>
+    <path d="M4.63
+4.1l-1-1.73S3.13 1.5 4 1c.87-.5 1.37.37 1.37.37l1 1.73s.5.87-.37
+1.37c-.87.57-1.37-.37-1.37-.37z" fill-opacity=".93"/>
+    <path
+            d="M3.1 6.37l-1.73-1S.5 4.87 1 4c.5-.87 1.37-.37 1.37-.37l1.73 1s.87.5.37
+1.37c-.5.87-1.37.37-1.37.37z" fill-opacity=".86"/>
+    <path d="M3
+9H1S0 9 0 8s1-1 1-1h2s1 0 1 1-1 1-1 1z" fill-opacity=".79"/>
+    <path d="M4.1 11.37l-1.73 1S1.5 12.87 1
+12c-.5-.87.37-1.37.37-1.37l1.73-1s.87-.5 1.37.37c.5.87-.37 1.37-.37 1.37z"
+          fill-opacity=".72"/>
+    <path d="M3.63 13.56l1-1.73s.5-.87
+1.37-.37c.87.5.37 1.37.37 1.37l-1 1.73s-.5.87-1.37.37c-.87-.5-.37-1.37-.37-1.37z"
+          fill-opacity=".65"/>
+    <path d="M7 15v-2s0-1 1-1 1 1 1 1v2s0 1-1
+1-1-1-1-1z" fill-opacity=".58"/>
+    <path d="M10.63
+14.56l-1-1.73s-.5-.87.37-1.37c.87-.5 1.37.37 1.37.37l1 1.73s.5.87-.37
+1.37c-.87.5-1.37-.37-1.37-.37z" fill-opacity=".51"/>
+    <path
+            d="M13.56 12.37l-1.73-1s-.87-.5-.37-1.37c.5-.87 1.37-.37 1.37-.37l1.73 1s.87.5.37
+1.37c-.5.87-1.37.37-1.37.37z" fill-opacity=".44"/>
+    <path d="M15
+9h-2s-1 0-1-1 1-1 1-1h2s1 0 1 1-1 1-1 1z" fill-opacity=".37"/>
+    <path d="M14.56 5.37l-1.73
+1s-.87.5-1.37-.37c-.5-.87.37-1.37.37-1.37l1.73-1s.87-.5 1.37.37c.5.87-.37 1.37-.37
+1.37z" fill-opacity=".3"/>
+    <path d="M9.64 3.1l.98-1.66s.5-.874
+1.37-.37c.87.5.37 1.37.37 1.37l-1 1.73s-.5.87-1.37.37c-.87-.5-.37-1.37-.37-1.37z"
+          fill-opacity=".23"/>
+</svg>