change color of green box upon send

Add this to your theme’s stylesheet:

div.wpcf7-mail-sent-ok {
	border: 2px solid #00ff00;
}

Thanks Takayuki – the problem is i cant find the theme′s stylesheet. im sure its right under my nose but when i chose the theme, all i see are .php files?

does anyone know where the theme′s stylesheet is located? I can′t find it… Thanks

I don’t get what you mean. Every WordPress theme must have at least a style.css file.

I added it to the end of the style.css file and changed #00ff00 to the color i wanted but nothing happens. Does it need to be added to a specific part of the style.css file? thanks so much for your help!

Tell me the URL of the site, please?

https://www.barcelonadiferente.com/comparte-tus-sitios-diferentes/

Styles in the plugin overwrite yours. You have two options:
1) Add !important to the css rule
2) Disable completely CF7 styles adding define(‘WPCF7_LOAD_CSS’, false); in your wp-config.php file and style the form yourself.

// spanish //
Lo haces bien. Lo que ocurre es que los estilos del plugin machacan los tuyos. Tienes dos opciones:
1) A?adir un !important a la regla
2) Deshabilitar por completo los estilos de CF7 a?adiendo define(‘WPCF7_LOAD_CSS’, false); a tu fichero wp-config.php (en la raíz de la instalación)