Oh, I see. In posting #1 there are hard-coded line feeds at the end of the lines produced with an editor software. Other posters (me to) uses only paragraphs and let the HTML software do the automatic wordwrap.

If somebody creates his posting within an editor first, he should use an editor like for example Geany with the ability of visual linebreak.
I use a 17" monitor and my font faces & sizes are normal.
What is "normal"? If I use a fontsize 10 I don't need horizontal scrolling for the codebox of posting #1. but with fontsize 16 i have to scroll.