Make flash messages fixed and sticked to bottom

app/assets/javascripts/main.js.coffee

@@ -89,7 +89,7 @@ $ ->
   if (flash = $(".flash-container")).length > 0
     flash.click -> $(@).fadeOut()
     flash.show()
-    setTimeout (-> flash.fadeOut()), 9000
+    setTimeout (-> flash.fadeOut()), 3000
 
   # Disable form buttons while a form is submitting
   $('body').on 'ajax:complete, ajax:beforeSend, submit', 'form', (e) ->

app/assets/stylesheets/common.scss

@@ -51,6 +51,10 @@ table a code {
   text-align: center;
   color: #fff;
   font-size: 14px;
+  position: fixed;
+  bottom: 0;
+  width: 100%;
+  opacity: 0.8;
 
   .flash-notice {
     background: #49C;