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The output of your command "ls -l *.html | sort -rn" is:

-rw-r--r-- 1 www-data www-data 306262 Apr 17  2021 Solaris.html
-rw-r--r-- 1 www-data www-data   9067 Apr 17  2021 head.html
-rw-r--r-- 1 www-data www-data   1057 Apr 17  2021 tail.html
-rw-r--r-- 1 www-data www-data   1025 Jan 18 13:16 contact.html
-rw-r--r-- 1 www-data www-data    318 Apr 17  2021 index.html