JSFiddle - React, Tailwind, and code Playground

HTML

<header>This is the header</header>
<div>
<form action="">
    <input id="email" type="email" required="required" />
        <p>Click send (at the bottom of the page), without filling the input field.</p>
            <br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />
    <input type="submit" id="btnSubmit" />
    </form>
</div>

CSS

body {
    margin: 0;
    margin-top: 50px;
    text-align: center;
}

header {
    position: fixed;
    width: 100%;
    height: 50px;
    background-color: #CCCCCC;
    text-align:center;
    top: 0;
}

JavaScript

(function (exports) {
    function valOrFunction(val, ctx, args) {
        if (typeof val == "function") {
            return val.apply(ctx, args);
        } else {
            return val;
        }
    }

    function InvalidInputHelper(input, options) {
        input.setCustomValidity(valOrFunction(options.defaultText, window, [input]));

        function changeOrInput() {
            if (input.value == "") {
                input.setCustomValidity(valOrFunction(options.emptyText, window, [input]));
            } else {
                input.setCustomValidity("");
            }
        }

        function invalid() {
            if (input.value == "") {
               input.setCustomValidity(valOrFunction(options.emptyText, window, [input]));
// the next line is required to work around a bug in WebKit (Chrome / Safari)
                var myelement = input.id;
   var el = document.getElementById(myelement);
    el.scrollIntoView(false);

            } else {
               console.log("INVALID!"); input.setCustomValidity(valOrFunction(options.invalidText, window, [input]));
            }
        }

        input.addEventListener("change", changeOrInput);
        input.addEventListener("input", changeOrInput);
        input.addEventListener("invalid", invalid);
    }
    exports.InvalidInputHelper = InvalidInputHelper;
})(window);



InvalidInputHelper(document.getElementById("email"), {
    defaultText: "Please enter an email address!",
    emptyText: "Please enter an email address!",
    invalidText: function (input) {
        return 'The email address "' + input.value + '" is invalid!';
    }
});