update `public_html` static files

public_html/css/style.css

@@ -162,7 +162,7 @@ body>main {
   scroll-snap-type: x proximity;
 }
 
-body>main>article {
+body>main>* {
 	overflow-y: scroll;
   padding: var(--v-un) var(--h-un);
   scroll-snap-align: center;
@@ -172,6 +172,14 @@ article:focus {
   outline: none;
 }
 
+body>main>article#start>h1>a::before {
+  content: "> ";
+}
+
+body>main>article#start>h1>a:after {
+  content: " <";
+}
+
 /* toc */
 nav.toc {
   margin-block: var(--v-un);