Reply To: Full Screen search – How to change font size of "Search products" very big field

Hello,

Try to use this class: .searchform ::-webkit-input-placeholder

Or add this code to the Theme settings > Custom CSS > Global

.searchform ::-webkit-input-placeholder { font-size:12px!important; }
.searchform :-ms-input-placeholder { font-size:12px!important;  }
.searchform ::-ms-input-placeholder { font-size:12px!important;   }
.searchform ::placeholder { font-size:12px!important;  }

Change font-size as per your needs and you can add other styles into the code.

Best Regards