Change Background Color in OAF

import oracle.cabo.style.CSSStyle;

                 CSSStyle customCss = new CSSStyle();

                 customUnCss.setProperty("background-color", "    #ee0000");//# -red

                 OAMessageStyledTextBean styledTextBean =(OAMessageStyledTextBean)webBean.findIndexedChildRecursive("POCommentsItem");

                 if(styledTextBean!=null)

                 {

                  styledTextBean.setInlineStyle(customUnCss);

                 }