How to make bold font of header of a specific column of simple table in qliksense via CSS?

[SystemError]

Hello everyone! 
I'm trying to make bold font of specific columns header in simple table in QlikSense. Im using css in multi KPI :

.qv-st table th{
  font-weight: bold;
}

with this code all headers becomes bold.

How to make bold font header only of second and fourth columns?  

[neerajthakur · Accepted solution]

Hi, if you want to just make table heading of just first column bold you can use this

.qv-st table th:first-child{
font-weight: bold;
}

You can replace td with tr for making specific row bold too.

.qv-st table td:nth-child(2){
font-weight: bold;
} 

For Making column 2 and 4 bold use this

.qv-st table th:nth-child(3){
font-weight: bold;
}

.qv-st table th:nth-child(7){
font-weight: bold;
}

If you want values to be bold just replace th with td

Please accept it as solution if it helps.

[SystemError]

Thanx for solution! 
My simple table is long, when I scroll it, another columns statrs being bold. Is it possible to fix bold font forever for 2nd and 4th columns? 

[neerajthakur]

Do you want data to be bold too, if yes do this 

.qv-st table td:nth-child(3){
font-weight: bold;
}

.qv-st table td:nth-child(7){
font-weight: bold;
}