fix: correct some html tags, css properties

_includes/views/article.html

@@ -6,6 +6,4 @@
 
     </div>
 
-  <div>
-
 </article>

_layouts/articles.html

@@ -11,4 +11,4 @@ sidebar: category-list
   {{ content }}
 
   {% include views/pagination.html %}
-<div>
+</div>

_layouts/post.html

@@ -46,8 +46,6 @@ sidebar:
     {%- endif -%}
 
   </section>
-
-    {%- include extensions/mathjax.html -%}
 </div>
 
 

_sass/yat/_base.scss

@@ -207,20 +207,23 @@ table {
   text-align: $table-text-align;
   color: lighten($text-color, 18%);
   border-collapse: collapse;
-  border: 1px solid $grey-color-light;
+
   tr {
     &:nth-child(even) {
       background-color: lighten($grey-color-light, 6%);
     }
   }
+
   th, td {
     padding: ($spacing-unit / 3) ($spacing-unit / 2);
   }
+
   th {
     background-color: lighten($grey-color-light, 3%);
     border: 1px solid darken($grey-color-light, 4%);
     border-bottom-color: darken($grey-color-light, 12%);
   }
+
   td {
     border: 1px solid $grey-color-light;
   }