Margin and padding adjustments.

services/web/app/views/project/editor/history/previewPanelV2.pug

@@ -19,7 +19,7 @@
 					}"
 				)
 				|  in <strong>{{history.diff.pathname}}</strong>
-			.btn.btn-info.btn-xs(
+			.history-toolbar-btn(
 				ng-click="toggleHistoryViewMode();"
 			) 
 				i.fa

services/web/public/stylesheets/app/editor/history.less

@@ -88,6 +88,7 @@
 		.loading {
 			text-align: center;
 			font-family: @font-family-serif;
+			margin-top: (@line-height-computed / 2);
 		}
 
 		ul {