design improve of form of key

app/assets/stylesheets/common.scss

@@ -1003,4 +1003,8 @@ p.time {
   color: #999;
   line-height: 16px;
   font-weight:bold;
-} 
+}
+
+.thin_area{
+  height: 150px;
+}

app/views/keys/_form.html.haml

@@ -11,7 +11,7 @@
       .input= f.text_field :title
     .clearfix
       = f.label :key
-      .input= f.text_area :key, :class => "xlarge"
+      .input= f.text_area :key, :class => [:xxlarge, :thin_area]
     .actions
       = f.submit 'Save', :class => "primary btn"
       = link_to "Cancel", keys_path, :class => "btn"