Ach ok. Dann habe ich das jetzt so gemacht:
<p style="margin-right:14em; margin-left:8em">
und es scheint jetzt keinerlei Probleme damit zu geben.
Ein anderes Problem habe ich aber noch und das sieht wirklich nicht falsch aus.
Line 96, Column 136: end tag for element "I" which is not open
…ganz viel text.</h6></i><br>
The Validator found an end tag for the above element, but that element is not currently open. This is often caused by a leftover end tag from an element that was removed during editing, or by an implicitly closed element (if you have an error related to an element being used where it is not allowed, this is almost certainly the case). In the latter case this error will disappear as soon as you fix the original problem.
If this error occurred in a script section of your document, you should probably read this FAQ entry.
Rot angezeigt wird ein ">" nach "<i"