JSFiddle - React, Tailwind, and code Playground
HTML
<input type="text" value="adasdadasd">
<a href="#">Change Font</a>
CSS
input{
font-size: 12px !important;
}
JavaScript
$('a').on('click',function(e){
$("input")
.css({
'cssText':'font-size:1.9rem !important',
"color":"#cc0000"
});
e.preventDefault();
});