Add icon to the grading message

common/lib/xmodule/xmodule/css/capa/display.scss

@@ -257,6 +257,8 @@ section.problem {
       }
 
       .grading {
+        background: url('../images/info-icon.png') left center no-repeat;
+        padding-left: 25px;
         text-indent: 0px;
         margin: 0px 7px 0 0;
       }

lms/static/sass/course/courseware/_courseware.scss

@@ -246,6 +246,7 @@ textarea.short-form-response {
     padding: 5px;
     margin-top: 5px;
     margin-bottom: 5px;
+    width: 100%;
 }
 
 section.self-assessment {