custom CSS

Hi,
i’m trying to customize the main width of the google recaptcha box.
i’m using this plugin with CF7 widget (left sidebar), but the standard width is too much wide to keep the box inside the sidebar.
So into the custom CSS field i’ve set:

.rc-anchor-normal { {width:200px !important}

but it doesn’t work (do nothing). The value is still default 300px

any sugestion?
Thanks