I am interested in this thing because I think that the framed formulas make my document more beautiful. For example how can I make this formula framed?
$F=m\cdot a$
I would like to make a light green frame around it. It does not need to be too wide (I mean it does not need to be as wide as the paper, which is A4 paper). So how can I make this frame? Can I modify the width of it?