spinner while derivating passphrase

css/main.css

@@ -443,3 +443,33 @@ a.loading {
   display: block;
   margin: 0 auto;
 }
+
+@keyframes rotateThis {
+	from { transform: scale( 1 ) rotate( 0deg );   }
+	to   { transform: scale( 1 ) rotate( 360deg ); }
+}
+
+@-webkit-keyframes rotateThis {
+	from { -webkit-transform: scale( 1 ) rotate( 0deg );   }
+	to   { -webkit-transform: scale( 1 ) rotate( 360deg ); }
+}
+
+.icon-rotate {
+	animation-name: rotateThis;
+	animation-duration: 2s;
+	animation-iteration-count: infinite;
+	animation-timing-function: linear;
+	-webkit-animation-name: rotateThis;
+  -webkit-animation-duration: 2s;
+  -webkit-animation-iteration-count: infinite;
+  -webkit-animation-timing-function: linear;
+}
+
+.spinner {
+ display:inline-block; 
+ width: 1em; 
+ text-align:center; 
+ line-height:1em; 
+ vertical-align:middle
+}
+