View file File name : sidebar-notice.css Content :#adminmenu .toplevel_page_site-notices .upsell_banner{background-color:#fff;color:#000}#adminmenu .toplevel_page_site-notices .upsell_banner .button{background-color:#096484;color:#fff}#adminmenu .toplevel_page_site-notices .upsell_banner .button:hover{background-color:#055d9c}