If it is a procedure like proc print, report or tabulate then style overrides for Borderwidth (bordertopwidth, borderbottomwidth, borderleft width or borderrightwidth to address them individually) and/or bordercolor (bordertopcolor etc) generally worked for me. The fun part is getting width unit as a simple number can get pretty large changes so something like Borderwidth=3px or borderwidth=0.1cm.
A brief example with proc print:
proc print data=sashelp.class;
var name /style={borderwidth=1};
var age /style={borderwidth=2};
var height / style={borderwidth=3};
run;
Each variable witll have a different thickness of line around the values.
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