Question

How to have square box background in of latex?

Answer 1

Explanation:

The color package should allow you to use the \colorbox command.

Examples (cited from this page, where you will find more details):

$\colorbox{red}{Black ~text~ on ~red ~background}$

$\colorbox{blue}{red}$

{Black text, red background, blue frame}

If you need just a border and no background color, the built-in \fbox{text} command should do fine...