fix(typeit): fix a TypeIt header link style bug

assets/css/_page/_single.scss

@@ -66,7 +66,7 @@
         font-weight: bolder;
       }
 
-      & > a:first-child::before {
+      & > .header-mark::before {
         content: "|";
         margin-right: .3125rem;
         color: $single-link-color;
@@ -77,7 +77,7 @@
       }
     }
 
-    h2 > a:first-child::before {
+    h2 > .header-mark::before {
       content: "#";
     }
 

src/js/theme.js

@@ -96,7 +96,7 @@
             for (let num = 1; num <= 6; num++) {
                 this.util.forEach(document.querySelectorAll('.page.single .content > h' + num), (header) => {
                     header.classList.add('headerLink');
-                    header.innerHTML = `<a href="#${header.id}"></a>${header.innerHTML}`;
+                    header.innerHTML = `<a href="#${header.id}" class="header-mark"></a>${header.innerHTML}`;
                 });
             }
         }