JSFiddle - React, Tailwind, and code Playground

HTML

<label class="intro-header" for="form-field-1"> Amount </label>
  <label>
  <input type="text" id="amount" placeholder="" onkeypress="return isNumberKey(event)" maxlength="10" />
 </label>

JavaScript

function isNumberKey(evt) {
        var charCode = (evt.which) ? evt.which : event.keyCode;
        
        if (charCode != 43 && charCode > 31
          && (charCode < 48 || charCode > 57))
            return false;
        return true;

    }