The $\mbox{\lfbox[rounded]{longfbox}}${math-needpdf=true} package
diagrams - How to change the background color of \framebox? - TeX - LaTeX Stack Exchange
How to draw a colored framebox without filling the background? - LaTeX4technics
horizontal alignment - Centering a \framebox - TeX - LaTeX Stack Exchange
Boxes and more boxes
How to use Boxes in LaTeX (Latex Advanced Tutorial-07) - YouTube
boxes - How to specify height and width of \fbox{} - TeX - LaTeX Stack Exchange
diagrams - How to change the background color of \framebox? - TeX - LaTeX Stack Exchange
Frame/Box around \chapter-, \section-headings, - TeX - LaTeX Stack Exchange
Figure with border in LaTeX – texblog
LaTeX/Boxes - Wikibooks, open books for an open world
How can I write in a box with fixed height? - TeX - LaTeX Stack Exchange
The pbox package
LaTeX/Boxes - Wikibooks, open books for an open world
LaTeX/Boxes - Wikibooks, open books for an open world
4.7.1 Framed Boxes
TeXclip
How to Use a Box Text in LaTeX
Different Kinds of Boxes in Latex - TAE
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
LaTeX Typeset Document Document Elements Graphic Block 31/3 Sideway output.to
Picture environment - Overleaf, Online LaTeX Editor
