style fixes

lms/static/sass/_discussion.scss

@@ -463,7 +463,8 @@ $tag-text-color: #5b614f;
   }
 
   .search-wrapper {
-    height: 110px;
+    margin-bottom: 50px;
+    margin-left: .5%;
   }
 
   .discussion-search-form {
@@ -730,10 +731,25 @@ $tag-text-color: #5b614f;
     .new-post-control {
       margin-left: 75%;
       margin-top: 1%;
+
+     .discussion-cancel-post {
+        margin-right: 1.5%;
+      } 
+    }
+
+    .reply-post-control {
+
+      .discussion-cancel-post {
+        margin-right: 1.5%;
+      }
     }
     
     .edit-post-control {
       margin-top: 1%;
+
+      .discussion-cancel-update {
+        margin-right: 1.5%;
+      }
     }
 
     .control-button {