How to make cnc address using htaccess?

Question

htaccess

Hello, I'm trying to make an address from site.ru/index.php?page=portfolio&id=263
such an address site.ru/portfolio/263
Applied: RewriteRule ^([-a-zA-Z0-9_]+)/([-a -zA-Z0-9_]+)/{0,1}$ /index.php?page=$1&id=$2 [L,QSA]
The result is: site.ru/portfolio&263
And I want to achieve: site.ru/portfolio /263 and also to have a redirect from the old url to this one, otherwise it only works when you write it with your hands, not an option.