diff --git a/templates/repo/view_file.tmpl b/templates/repo/view_file.tmpl
index 7010e9d690..721c795617 100644
--- a/templates/repo/view_file.tmpl
+++ b/templates/repo/view_file.tmpl
@@ -36,11 +36,7 @@
 		</div>
 		<div class="file-header-right file-actions flex-text-block tw-flex-wrap">
 		{{if .FileSidebarHTML}}
-		<div class="ui compact icon buttons">
-			<button class="ui mini basic button" id="toggle-sidebar-btn" data-tooltip-content="{{ctx.Locale.Tr "toc"}}">
-				{{svg "octicon-list-unordered" 15}}
-			</button>
-		</div>
+			<button class="btn-octicon" id="toggle-sidebar-btn" data-tooltip-content="{{ctx.Locale.Tr "toc"}}">{{svg "octicon-list-unordered" 15}}</button>
 		{{end}}
 			{{/* this componment is also controlled by frontend plugin renders */}}
 			<div class="ui compact icon buttons file-view-toggle-buttons {{Iif .HasSourceRenderedToggle "" "tw-hidden"}}">