update

assets/_default/single.scss

@@ -7,7 +7,7 @@
 
 .section-article {
   article {
-    margin: 80px auto;
+    margin: 0 auto;
     max-width: 720px;
     .meta {
       color: $white-dark;

assets/import/include.scss

@@ -63,10 +63,8 @@
     }
   }
   @media (max-width: 900px) {
-    main {
-      .section.articles.inner {
-        grid-template-columns: repeat(1, 1fr);
-      }
+    .section.posts .inner {
+      grid-template-columns: repeat(1, 1fr);
     }
   }
 }

assets/import/main.scss

@@ -42,6 +42,7 @@ h4 {
   font-size: .9em;
 }
 hr {
+  border-color: $bg60;
   color: $bg60;
   margin: 60px 0;
 }

layouts/_default/single.html

@@ -13,9 +13,7 @@
           <span>{{ with .Params.author }}by {{ end }}{{ .Params.author }}</span>
         </p>
         <h1 class="title">{{ .Title }}</h1>
-        {{ with .Params.featured_image }}
-        <img src="{{ . | relURL }}" loading="lazy" alt="">
-        {{ end }}
+        {{ with .Params.featured_image }}<img src="{{ . | relURL }}" loading="lazy" alt="">{{ end }}
         {{ .Content }}
         <aside class="meta">
         {{ with .Params.topics }}