Fix some sizing issues in the CSS.

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

@@ -239,13 +239,13 @@ div.result-container, section.open-ended-child {
                 margin:10px;
                 position: relative;
                 padding: 15px;
-                width: 200px;
+                width: 150px;
                 height:100%;
                 display: inline-block;
                 min-height: 50px;
                 min-width: 50px;
                 background-color: #CCC;
-                font-size: 1em;
+                font-size: .9em;
             }
             .grade {
               position: absolute;