.Go to your Cpanel file manager public_html folder and edit .htaccess file or create new one if it does not exist. and paste this there

​

<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>