update `public_html` static files

public_html/css/style.css

@@ -199,6 +199,13 @@ pre {
   overflow-y: scroll;
 }
 
+pre::before,
+pre::after {
+  display: block;
+  content: "```";
+  color: var(--blue);
+}
+
 /* inline text semantics */
 
 a {
@@ -223,8 +230,10 @@ a:visited:active {
   text-decoration-color: var(--red);
 }
 
-code {
-  color: var(--orange);
+:not(pre)>code::before,
+:not(pre)>code::after {
+  content: "`";
+  color: var(--blue);
 }
 
 sup {
@@ -307,7 +316,8 @@ article.post {
 }
 
 article.post>header,
-article.post>nav {
+article.post>nav,
+article.post>footer {
   margin: 1rlh 0;
 }