Fixed drop box styles

app/css/app.css

@@ -1858,9 +1858,8 @@ span.emoji {
 .im_send_dropbox_wrap {
   background: #FFF;
   display: none;
-  padding: 15px 10px;
-  margin: 1px;
-  border-radius: 4px;
+  padding: 17px 10px 0;
+  border: 1px dashed #999;
   overflow: hidden;
   text-align: center;
   color: #999;

app/js/directives.js

@@ -1312,7 +1312,7 @@ angular.module('myApp.directives', ['myApp.filters'])
           if (e.type == 'dragenter' || e.type == 'dragover') {
             if (dragStateChanged) {
               $(dropbox)
-                .css({height: $(editorElement).height() + 12, width: $(editorElement).width() + 12})
+                .css({height: editorElement.offsetHeight + 2, width: editorElement.offsetWidth})
                 .show();
             }
           } else {