Increase the size of link button using custom CSS

I'm very new to writing custom CSS in retool. I have a link button and am wondering how to increase its font size (including the prefix icon). I tried to use the below code but it didn't work. Would like to ask for some suggestion. Thank you!

._retool-link2 .ant-btn-primary {
     font-size: 36px;

Hey @doris.l, try this:

._retool-link1 button span {
  font-size: 36px