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HTML

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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <!-- Preloader -->
    <div class="loader-mask">
        <div class="loader">
            <div></div>
            <div></div>
        </div>
    </div>
<!-- Preloader -->

<!-- Demo Content -->

    <div class="container">
        <div class="starter-template">
            <h2>Hello,</h2>
            <h2>Preloader with preloaded Page</h2>
            <p class="lead">*Reload to check preloader. (preloader time automatically adjust according to page content,)</p>
        </div>
        <nav class="navbar navbar-inverse">
            <div class="container-fluid">
                <div class="navbar-header">
                    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar"> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <a class="navbar-brand" href="#">Portfolio</a> </div>
                <div class="collapse navbar-collapse" id="myNavbar">
                    <ul class="nav navbar-nav">
                        <li class="active"><a href="#">Home</a></li>
                        <li><a href="#">About</a></li>
                        <li><a href="#">Gallery</a></li>
                        <li><a href="#">Contact</a></li>
                    </ul>
                    <ul class="nav navbar-nav navbar-right">
                        <li><a href="#"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>
                    </ul>
                </div>
            </div>
        </nav>
        <div class="jumbotron">
            <div class="container text-center">
                <h1>My Portfolio</h1>
                <p>Some text that represents "Me"...</p>
            </div>
        </div>
        <div class="container-fluid bg-3 text-center">
            <h3>Some of my Work</h3>
            <br>
            <div class="row">
                <div class="col-sm-3">
                    <p>Some text..</p> <img src="https://placehold.it/150x80?text=IMAGE" class="img-responsive" style="width:100%" alt="Image"> </div>
                <div class="col-sm-3">
                    <p>Some text..</p> <img src="https://placehold.it/150x80?text=IMAGE" class="img-responsive" style="width:100%" alt="Image"> </div>
                <div class="col-sm-3">
                    <p>Some text..</p> <img src="https://placehold.it/150x80?text=IMAGE" class="img-responsive" style="width:100%" alt="Image"> </div>
                <div class="col-sm-3">
                    <p>Some text..</p> <img src="https://placehold.it/150x80?text=IMAGE" class="img-responsive" style="width:100%" alt="Image"> </div>
            </div>
        </div>
        <br>
        <div class="container-fluid bg-3 text-center">
            <div class="row">
                <div class="col-sm-3">
                    <p>Some text..</p> <img src="https://placehold.it/150x80?text=IMAGE" class="img-responsive" style="width:100%" alt="Image"> </div>
                <div class="col-sm-3">
                    <p>Some text..</p> <img src="https://placehold.it/150x80?text=IMAGE" class="img-responsive" style="width:100%" alt="Image"> </div>
                <div class="col-sm-3">
                    <p>Some text..</p> <img src="https://placehold.it/150x80?text=IMAGE" class="img-responsive" style="width:100%" alt="Image"> </div>
                <div class="col-sm-3">
                    <p>Some text..</p> <img src="https://placehold.it/150x80?text=IMAGE" class="img-responsive" style="width:100%" alt="Image"> </div>
            </div>
        </div>
        <div class="container-fluid bg-3 text-center" style="padding: 50px;">
            <iframe width="854" height="480" src="https://www.youtube.com/embed/6jiNS_4CEug" frameborder="0" allowfullscreen></iframe>
        </div>
        <br>
        <br>
        <footer class="container-fluid text-center">
            <p>Footer Text</p>
        </footer>
!

CSS 

              
                body {
    padding-top: 50px;
}

.starter-template {
    padding: 40px 15px;
    text-align: center;
}


/* Preloader
-------------------------------------------------------*/

.loader-mask {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #fff;
    z-index: 99999;
}

.loader {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 50px;
    height: 50px;
    font-size: 0;
    color: #00c9d0;
    display: inline-block;
    margin: -25px 0 0 -25px;
    text-indent: -9999em;
    -webkit-transform: translateZ(0);
    -ms-transform: translateZ(0);
    transform: translateZ(0);
}
.lead{
  font-size:13px;
}
.loader div {
    background-color: #d9b06a;
    display: inline-block;
    float: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 50px;
    height: 50px;
    opacity: .5;
    border-radius: 50%;
    -webkit-animation: ballPulseDouble 2s ease-in-out infinite;
    animation: ballPulseDouble 2s ease-in-out infinite;
}

.loader div:last-child {
    -webkit-animation-delay: -1s;
    animation-delay: -1s;
}

@-webkit-keyframes ballPulseDouble {
    0%,
    100% {
        -webkit-transform: scale(0);
        transform: scale(0);
    }
    50% {
        -webkit-transform: scale(1);
        transform: scale(1);
    }
}

@keyframes ballPulseDouble {
    0%,
    100% {
        -webkit-transform: scale(0);
        transform: scale(0);
    }
    50% {
        -webkit-transform: scale(1);
        transform: scale(1);
    }
}
!

JS 

              
                $(window).load(function () {
            // Preloader
            $('.loader').fadeOut();
            $('.loader-mask').delay(350).fadeOut('slow');
        });
!
999px

Console