JSFiddle - React, Tailwind, and code Playground

HTML

<form>
    <input type="text" value="a" />
    <input type="text" value="b" />
    <input type="text" value="c" />
    <input type="text" value="d" />
    <input type="text" value="e" />
    <input type="text" value="1" />
    <input type="text" value="2" />
    <input type="text" value="3" />
    <input type="text" value="4" />
    <input type="text" value="5" />
    <input type="text" value="6.6" />
    <input type="text" value="7.7" />
    <input type="text" value="8.8" />
    <input type="text" value="9.9" />
    <input type="text" value="10.10" />
</form>

JavaScript

$('form input[type="text"]').each(function(i,e){
    if (isNaN(parseFloat(e.value,10))){
        $(e).css('backgroundColor','red');
    }
});