Fix the font size

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

@@ -734,7 +734,7 @@ section.problem {
           min-height: 50px;
           min-width: 50px;
           background-color: #CCC;
-          text-size: 1.5em;
+          font-size: 1em;
       }
       .grade {
         position: absolute;