[Solved] how to make required area non-required

i use comment system just as poll, my users read  the  topic and  write down  only three words as   reaction

i want my members just to use extra comment field not the main area 

extra fields are textline

i have two way 

1) making the default comment area non required, and hide it with css  (i mean only extra comment fields will be seen and used)

2) shaping the main default comment area as a text line (with css ) 

i tried but failed

is there anyone can help