fbox has very thick lines - TeX - LaTeX Stack Exchange
LaTeX/Boxes - Wikibooks, open books for an open world
diagrams - How to change the background color of \framebox? - TeX - LaTeX Stack Exchange
The pbox package
The $\mbox{\lfbox[rounded]{longfbox}}${math-needpdf=true} package
The minipage environment - LaTeX-Tutorial.com
equations - Create environment out of eqnarray with frame box - TeX - LaTeX Stack Exchange
LaTeX/Boxes - Wikibooks, open books for an open world
The $\mbox{\lfbox[rounded]{longfbox}}${math-needpdf=true} package
LaTeX 技巧947： 玩转fbox，排版再不难- LaTeX科技排版工作室
how do I make 'aside boxes' : r/LaTeX
boxes - How to specify height and width of \fbox{} - TeX - LaTeX Stack Exchange
Exam question with \fbox - TeX - LaTeX Stack Exchange
How to use Boxes in LaTeX (Latex Advanced Tutorial-07) - YouTube
diagrams - How to change the background color of \framebox? - TeX - LaTeX Stack Exchange
4.7.1 Framed Boxes
How to Use a Box Text in LaTeX
How to display formulas inside a box or frame in Latex ? \boxed - math-linux.com
LaTeX -
Frame/Box around \chapter-, \section-headings, - TeX - LaTeX Stack Exchange
Figure with border in LaTeX – texblog
Boxes and more boxes
Picture environment - Overleaf, Online LaTeX Editor
horizontal alignment - Centering a \framebox - TeX - LaTeX Stack Exchange
Different Kinds of Boxes in Latex - TAE
line breaking - how to get a newline in \fbox? - TeX - LaTeX Stack Exchange
![天地有情 [LaTeX] fbox --- \fbox の拡張バージョン](https://blog-imgs-115.fc2.com/k/o/n/konoyonohana/fbox01.png "天地有情 [LaTeX] fbox --- \fbox の拡張バージョン")