fixed dogear issue

lms/static/sass/_discussion.scss

@@ -1125,12 +1125,13 @@ body.discussion {
   .discussion-column {
     float: right;
     @include box-sizing(border-box);
+    width: 68%;
+    max-width: 800px;
+    min-height: 500px;
     border: 1px solid #aaa;
     border-radius: 3px;
     background: #fff;
     box-shadow: 0 1px 2px rgba(0, 0, 0, .05);
-    width: 68%;
-    min-height: 500px;
 
     &.sidebar-fixed {
       margin-left: 32%;
@@ -1181,7 +1182,7 @@ body.discussion {
       display: block;
       position: absolute;
       top: -1px;
-      right: -2px;
+      right: -1px;
       width: 52px;
       height: 51px;
       background: url(../images/follow-dog-ear.png) 0 -52px no-repeat;