Style of last updated link is consistent with rest of the sidebar

Fix #48

static/css/elegant.css

@@ -396,15 +396,11 @@ ul.top-menu li a {
 .table-of-content .toc {
     font-size: 0.7em;
 }
-.last_updated a {
-     color: black;
-     border-bottom: thin dashed darkgray;
-}
-.last_updated a:hover {
-     text-shadow: none;
-     text-decoration: none;
-     border-bottom: medium none;
-     color: rgb(0, 85, 128);
+.last-updated a {
+    color:rgb(51,51,51);
+}
+.last-updated a:hover {
+    text-decoration:none;
 }
 
 a.headerlink {

templates/article.html

@@ -85,7 +85,7 @@
             {% endif %}
             {% if article.modified %} 
             <h4>Last Updated</h4>
-            <div class="last_updated">{{ article.modified }}</div>
+            <div class="last-updated">{{ article.modified }}</div>
             {% endif %}
             {% if article.category %}
             <h4>Category</h4>