JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">

<head>

    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="description" content="">
    <meta name="author" content="">

    <title>RAK ICC - open your offshore company in UAE</title>

    <!-- Bootstrap Core CSS -->
    <link href="css/bootstrap.min.css" rel="stylesheet">

    <!-- Custom CSS -->
    <link href="css/agency.css" rel="stylesheet">
    <link href="css/jquery-ui.min.css" rel="stylesheet">
    <link href="css/jquery-ui.structure.min.css" rel="stylesheet">
    <link href="css/jquery-ui.theme.min.css" rel="stylesheet">
    <link href="css/jquery-ui.css" rel="stylesheet">
    <link href="css/jquery-ui.structure.css" rel="stylesheet">
    <link href="css/jquery-ui.theme.css" rel="stylesheet">
    
    <!-- Custom Fonts -->
    <link href="font-awesome/css/font-awesome.min.css" rel="stylesheet" type="text/css">
    <link href="https://fonts.googleapis.com/css?family=Montserrat:400,700" rel="stylesheet" type="text/css">       
    <link href='https://fonts.googleapis.com/css?family=Kaushan+Script' rel='stylesheet' type='text/css'>
    <link href='https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic,700italic' rel='stylesheet' type='text/css'>
    <link href='https://fonts.googleapis.com/css?family=Roboto+Slab:400,100,300,700' rel='stylesheet' type='text/css'>
    
    <!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
        <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>
        <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script>
    <![endif]-->

</head>

<body id="page-top" class="index">

    <!-- Contact Section -->
    <section id="contact">
        <div class="container">
           ...

CSS

body {
    overflow-x: hidden;
    font-family: "Roboto Slab", "Helvetica Neue", Helvetica, Arial, sans-serif;
        
}

.wrapper{
    overflow: hidden;
    position: fixed;
    top: 50%;
    right: 0;
    bottom: 0;
    left: 0;
    font-size: 0;
    line-height: 0;
}
.item{
    width: 100%;
    height: 100%;
    vertical-align: middle;
    text-align: left;
    white-space: nowrap;
}
.item:after{
    content: '';
    display: inline-block;
    height: 100%;
    vertical-align: middle;
}
img{
    max-width: 100%;
    max-height: 100%;
    vertical-align: middle;
}

.text-muted {
    color: #777
}

.text-primary {
    color: #fed136
}

p {
    font-size: 14px;
    line-height: 1.75
}

p.large {
    font-size: 16px
}

a,
a:hover,
a:focus,
a:active,
a.active {
    outline: 0
}

a {
    color: #fed136
}

a:hover,
a:focus,
a:active,
a.active {
    color: #fec503
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: Montserrat, "Helvetica Neue", Helvetica, Arial, sans-serif;
    text-transform: uppercase;
    font-weight: 700
}

.img-centered {
    margin: 0 auto
}

.bg-light-gray {
    background-color: #f7f7f7
}

.bg-darkest-gray {
    background-color: #222
}

.btn-primary {
    color: #fff;
    background-color: #fed136;
    border-color: #fed136;
    font-family: Montserrat, "Helvetica Neue", Helvetica, Arial, sans-serif;
    text-transform: uppercase;
    font-weight: 700
}

.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active,
.btn-primary.active,
.open .dropdown-toggle.btn-primary {
    color: #fff;
    background-color: #fec503;
    border-color: #f6bf01
}

.btn-primary:active,
.btn-primary.active,
.open .dropdown-toggle.btn-primary {
    background-image: none
}

.btn-primary.disabled,
.btn-primary[disabled],
fieldset[disabled] .btn-primary,
.btn-primary.disabled:hover,
.btn-primary[disabled]:hover,
fieldset[disabled] .btn-primary:hover,
.btn-primary.disabled:focus,
.btn-primary[disabled]:focus,
fieldset[disabled]...

JavaScript

$(function() {

    $("#contactForm input,#contactForm textarea").jqBootstrapValidation({
        preventSubmit: true,
        submitError: function($form, event, errors) {
            // additional error messages or events
        },
        submitSuccess: function($form, event) {
            event.preventDefault(); // prevent default submit behaviour
            // get values from FORM
            var name = $("input#name").val();
            var email = $("input#email").val();
            var phone = $("input#phone").val();
            var datepicker = $("#datepicker").val();
            var message = $("textarea#message").val();
            var firstName = name; // For Success/Failure Message
            // Check for white space in name for Success/Fail message
            if (firstName.indexOf(' ') >= 0) {
                firstName = name.split(' ').slice(0, -1).join(' ');
            }
            $.ajax({
                url: "././mail/contact_me.php",
                type: "POST",
                data: {
                    name: name,
                    phone: phone,
                    email: email,
                    message: message,
                    datepicker: datepicker
                },
                cache: false,
                success: function() {
                    // Success message
                    $('#success').html("<div class='alert alert-success'>");
                    $('#success > .alert-success').html("<button type='button' class='close' data-dismiss='alert' aria-hidden='true'>&times;")
                        .append("</button>");
                    $('#success > .alert-success')
                        .append("<strong>Your message has been sent. </strong>");
                    $('#success > .alert-success')
                        .append('</div>');

                    //clear all fields
                    $('#contactForm').trigger("reset");
                },
                error: function() {
                  ...