This userscrpit changes all lihkg.com pages to be full width and dynamically sized.
As a Greasemonkey / UserScript:
This script can be installed into Tampermonkey or other user script plugins. Select wide-lihkg.user.js and click Raw button, Tampermonkey should prompt for installation of a new userscript. Click install and reload lihkg.com webpage to take effect.
Just copy the content of wide-lihkg.user.js and save as a new userscript, and the script will be enabled on your next visit.