Put in folder public: .htaccess
And inside .htaccess this:
<IfModule mod_rewrite.c> RewriteEngine On RewriteBase / RewriteRule ^index\.html$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME} !-l RewriteRule . /index.html [L] </IfModule>

if you are using Hostringer
create a .htaccess (make sure there's no file extension like .txt) in root file of ur file manager
paste the below code
RewriteEngine On RewriteBase / RewriteRule ^index\.html$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.html [L]
refresh the website