[users@httpd] How to make mod_autoindex mobile-friendly?

[Jim Avera]

Google complains that directories displayed by mod_autoindex have 
"Mobile Usability Issues", specifically:

Clickable elements too close together
Text too small to read
Viewport not set
What's the best way to fix this?

I can't change the Apache server config.  My top-level .htaccess file 
contains

   Options +Indexes
   IndexOptions +NameWidth=* Charset=UTF-8
   IndexOptions FancyIndexing FoldersFirst HTMLTable
   IndexOrderDefault Ascending Name

Thanks in advance,

-Jim Avera