fix #315

app/coffee/modules/issues/detail.coffee

@@ -520,7 +520,6 @@ CommentDirective = () ->
     link = ($scope, $el, $attrs, $model) ->
         $el.on "click", ".activity-title", (event) ->
             event.preventDefault()
-            $el.find(".activity-inner").toggle()
             $el.find(".activity-inner").toggleClass("active")
 
         $scope.$on "$destroy", ->

app/styles/modules/activity.scss

@@ -1,45 +1,3 @@
-.us-activity {
-    margin-bottom: 1rem;
-    padding: 0 1rem;
-}
-
-.activity-title {
-    display: block;
-    padding: .5rem;
-    &:hover {
-        .icon {
-            @include transform(rotate(180deg));
-            @include transition(all.2s linear);
-            color: $green-taiga;
-        }
-    }
-    .icon {
-        @include transform(rotate(0));
-        @include transition(all.2s linear);
-        color: $grayer;
-        float: right;
-    }
-}
-
-.activity-inner {
-    @include table-flex;
-    border-bottom: 1px solid $gray-light;
-    padding: 1rem 0;
-    &:last-child {
-        border-bottom: 0;
-    }
-    .activity-changed,
-    .activity-fromto {
-        @include table-flex-child(1, 50px, 0);
-    }
-    .activity-changed {
-        @extend %bold;
-    }
-    .activity-fromto {
-        @extend %small;
-    }
-}
-
 .activity-single {
     @include table-flex;
     border-bottom: 2px solid $gray-light;

app/styles/modules/comments.scss

@@ -51,6 +51,9 @@
         background: $whitish;
         .activity-inner {
             display: none;
+            &.active {
+                display: flex;
+            }
         }
     }
     .date {