addressing FED feedback

lms/static/sass/course/instructor/_instructor_2.scss

@@ -221,7 +221,7 @@ section.instructor-dashboard-content-2 {
   .message {
     margin-bottom: $baseline;
     display: none;
-    border-radius: ($baseline/$baseline);
+    border-radius: 1px;
     padding: ($baseline*0.75) $baseline;
 
     &.is-shown {
@@ -455,6 +455,7 @@ section.instructor-dashboard-content-2 {
       margin-bottom: ($baseline/2);
       border-bottom: 1px solid $gray-l4;
       padding-bottom: ($baseline/2);
+    }
 
     .title-value, .group-count {
       display: inline-block;
@@ -472,7 +473,6 @@ section.instructor-dashboard-content-2 {
       @extend %t-weight4;
     }
   }
-  }
 
   .cohort-management-group-setup {
     @include clearfix();