The CSS3 at forum.qt.io is broken.

I've discovered at least two deficiencies:

1. blockQuote { block-padding: 1em }

   This is especially problematic for blockQuote pre code:

   1. Source

      Unable to find source-code formatter for language: markdown. Available languages are: actionscript, ada, applescript, bash, c, c#, c++, cpp, css, erlang, go, groovy, haskell, html, java, javascript, js, json, lua, none, nyan, objc, perl, php, python, r, rainbow, ruby, scala, sh, sql, swift, visualbasic, xml, yaml

      > ~~~py
      > #!/usr/bin/env sh
      > ~~~

   2. Rendered

      
      It's similar to github.com/github/markup/issues/1851.

2. <input type="checkbox" style="display: block">

   1. Source

      Unable to find source-code formatter for language: markdown. Available languages are: actionscript, ada, applescript, bash, c, c#, c++, cpp, css, erlang, go, groovy, haskell, html, java, javascript, js, json, lua, none, nyan, objc, perl, php, python, r, rainbow, ruby, scala, sh, sql, swift, visualbasic, xml, yaml

      1. [x] [`example.com`](https://example.com)

   2. Rendered

      

The linked-to images are also attached.