htaccess how to set something like catch all links to one index.html?

Question

I have to disable CMS and there are a lot of link in the air, ight now there is only static page on html5 how to set something like catch all addresses from domain and redirect them to main index.html

I try to add

RewriteEngine on
RewriteRule ^(.*)$ http://www.domain.co.uk/ [R=301,L]

but not working