you very welcome @tuhamworld
for your question it’s yes and to make sure that you got it’s power
so if we use an example to illustrate it
try to change you colgroup to this
<colgroup>
<col span="2">
<col >
<col span="9" style="border:2px solid #000;">
notice the style will apply to all those 9 column which save us a lot writing
hope that help and have a nice day 