#txt_a{
	
font-size:20px;
font-weight:bold;
text-align:center;
}
#txt_b{
	
font-size:20px;
font-weight:bold;
text-align:center;
}
#txt_c{
	
font-size:20px;
font-weight:bold;
text-align:center;
}
#txt_d{
	
font-size:20px;
font-weight:bold;
text-align:center;
}