edit css

hi،
i use wp 3.5.2 and last version of your plugin,

your plugin show a box after <!–more> ,
but it grafic is bad and i want to edit it(add border-radius , box-shodow and ect)

i have to edit which file?
i edit style.css and function.php but it did’nt change…

http://wordpress.org/extend/plugins/all-in-one-schemaorg-rich-snippets/