diff --git a/media/css/seahub.css b/media/css/seahub.css
index 71a2e90a61..73bf9c77fd 100644
--- a/media/css/seahub.css
+++ b/media/css/seahub.css
@@ -1550,6 +1550,7 @@ textarea:-moz-placeholder {/* for FF */
 }
 .msg {
     word-wrap: break-word;
+    padding:1px 0; /* to fix 'top border missing' when only 1 discussion & no scrollbar in chrome */
     margin:15px 0 20px;
 }
 .msg .txt {
diff --git a/templates/snippets/bottom_bar.html b/templates/snippets/bottom_bar.html
index 1e19674245..f91761153c 100644
--- a/templates/snippets/bottom_bar.html
+++ b/templates/snippets/bottom_bar.html
@@ -7,7 +7,7 @@ $('#footer').addClass('hide');
 
 {% if groups %}
 function getAndHandleDiscussions(data_html) {
-    $('#discussions-to-grp').html(data_html).css({'max-height':$(window).height() * 0.9 - $('#bottom-bar').height() - $('#discuss-to-group-caret').height() - $('#discuss-to-group-form').outerHeight()}).removeClass('hide');
+    $('#discussions-to-grp').html(data_html).css({'max-height': parseInt($(window).height() * 0.9 - $('#bottom-bar').height() - $('#discuss-to-group-caret').height() - $('#discuss-to-group-form').outerHeight())}).removeClass('hide'); // 'parseInt' to fix '.msg-main top border missing when the ul's max-height is xxx.5px'
     {% include 'group/msg_js.html' %}
 }
 $('#discuss').click(function() {