Minor improvements on notifications mechanism

Packages/ohif-hotkeys/client/components/form.html

@@ -15,7 +15,7 @@
         <div class="form-buttons clearfix">
             {{#button class='btn btn-danger pull-left' action='resetDefaults'}}Reset to Defaults{{/button}}
             {{#button class='btn btn-primary pull-right' action='save'}}Save{{/button}}
-            {{#button class='btn btn-default pull-right m-r-1' tagAttributes=(extend '' data-dismiss='modal')}}Close{{/button}}
+            {{#button class='btn btn-secondary pull-right m-r-1' tagAttributes=(extend '' data-dismiss='modal')}}Close{{/button}}
         </div>
     {{/form}}
 </template>