Change blog classes

layouts/blog/single.html

@@ -5,7 +5,7 @@
     <div class="row justify-content-center">
       <div class="col-lg-8">
         <article class="site-blog-details">
-          <p><span>{{ .PublishDate.Format "January 2, 2006" }}</span> by <span>{{ .Params.author }}</span></p>
+          <p class="site-blog-details-header"><span>{{ .PublishDate.Format "January 2, 2006" }}</span> by <span>{{ .Params.author }}</span></p>
           <h2 class="blog-title">{{ .Title }}</h2>
           <img class="feature-image" src="{{ .Params.feature_image | absURL }}" alt="blog-feature-image">
           {{ .Content }}
@@ -17,4 +17,4 @@
 
 {{ partial "call-to-action.html" . }}
 
-{{ end }}
+{{ end }}