Use whole button as link

templates/repo/commits.tmpl

@@ -5,14 +5,12 @@
 	  <div class="ui secondary menu">
 	    {{template "repo/branch_dropdown" .}}
 	    <div class="fitted item">
-	      <div class="ui basic small button">
-		<a href="{{.RepoLink}}/graph">
+		<a href="{{.RepoLink}}/graph" class="ui basic small button">
 		  <span class="text">
 		    <i class="octicon octicon-git-branch"></i>
 		  </span>
 		  {{.i18n.Tr "repo.commit_graph"}}
 		</a>
-	      </div>
 	    </div>
 	  </div>
 	  {{template "repo/commits_table" .}}