follow @silverwind's suggestion

Author: lunny

templates/repo/wiki/view.tmpl

@@ -66,12 +66,12 @@
 
 		<div class="wiki-content-parts">
 			{{if .sidebarTocContent}}
-			<div class="markup wiki-content-sidebar wiki-content-toc tw-rounded">
+			<div class="markup wiki-content-sidebar wiki-content-toc">
 				{{.sidebarTocContent | SafeHTML}}
 			</div>
 			{{end}}
 
-			<div class="markup wiki-content-main tw-rounded {{if or .sidebarTocContent .sidebarPresent}}with-sidebar{{end}}">
+			<div class="markup wiki-content-main {{if or .sidebarTocContent .sidebarPresent}}with-sidebar{{end}}">
 				{{template "repo/unicode_escape_prompt" dict "EscapeStatus" .EscapeStatus "root" $}}
 				{{.content | SafeHTML}}
 			</div>

web_src/css/repo/wiki.css

@@ -21,6 +21,7 @@
 
 .repository.wiki .wiki-content-parts .markup {
   border: 1px solid var(--color-secondary);
+  border-radius: var(--border-radius);
   padding: 1em;
   margin-top: 1em;
   font-size: 1em;