Today when I saw a question, I laughed.
A Contradiction $\space \space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space \space \space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space \blacksquare$
gives
A Contradiction $\space \space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space \space \space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space\space \blacksquare$
I tried to improve it, but I couldn't. All the ways that I knew from $\LaTeX$, didn't work.
HTML too.
<div align="right">text</align>
Och! It doesn't work!
Is here any way to do that?
\hspace{500px}
to get a similarly ugly result with less typing. MathJax is not meant for page layout. HTML/CSS is, but SE intentionally restricts the allowed HTML tags and strips CSS styles. So, the improvement would be to not do that. Some books use a different placement of $\blacksquare$, not right-aligned but at some distance from the text. That would work. $\quad \blacksquare$ $\endgroup$