clean up

static/css/style-loadingcircle.css

@@ -0,0 +1,31 @@
+.favicon-wrapper {
+    position: relative;
+    display: inline-block;
+    width: 16px;
+    height: 16px;
+}
+
+.favicon-wrapper.loading img {
+    visibility: hidden; /* hide placeholder */
+}
+
+.favicon-wrapper.loading::after {
+    content: "";
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    width: 14px;
+    height: 14px;
+    margin: -8px 0 0 -8px;
+    border: 2px solid var(--html-bg);
+    border-top-color: var(--fg);
+    border-radius: 50%;
+    animation: spin 0.7s linear infinite;
+    z-index: 2;
+}
+
+@keyframes spin {
+    to {
+        transform: rotate(360deg);
+    }
+}