Background picture on EmberJS theme having troubles loading

I am using the EmberJS Start Bootstrap landing theme from emberjsthemes.com and am having some troubles playing around with it.

I am first trying to add an opacity to the background image, but keeping the text in full opacity. I've gone about it via ::before on the .intro-header css element. THe problem i am having is that the image i am searching for does not seem to be found(Looking under sources in inspector shows the img folder is not present?)

Here is an image of the sources from the browser:

Here is the code from my land-page.less file:

body,
html {
    width: 100%;
    height: 100%;
}

body,
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: "Lato","Helvetica Neue",Helvetica,Arial,sans-serif;
    font-weight: 700;
}

.topnav {
    font-size: 14px;
}

.lead {
    font-size: 18px;
    font-weight: 400;
}

.intro-header {
    padding-top: 50px; /* If you're making other pages, make sure there is 50px of padding to make sure the navbar doesn't overlap content! */
    padding-bottom: 50px;
    text-align: center;
}

.intro-header::before {
   background: url(../img/Beach.jpg) no-repeat center center;
   background-size: cover;
   opacity: .2;
}
.intro-message {
    color: #f8f8f8;
    position: relative;
    padding-top: 20%;
    padding-bottom: 20%;
}

.intro-message h1 {
    margin: 0;
    text-shadow: 2px 2px 3px rgba(0,0,0,0.6);
    font-size: 5em;
}

.intro-divider {
    width: 400px;
    border-top: 1px solid #f8f8f8;
    border-bottom: 1px solid rgba(0,0,0,0.2);
}

.intro-message > h3 {
    text-shadow: 2px 2px 3px rgba(0,0,0,0.6);
}

@media(max-width:767px) {
    .intro-message {
        padding-bottom: 15%;
    }

    .intro-message > h1 {
        font-size: 3em;
    }

    ul.intro-social-buttons > li {
        display: block;
        margin-bottom: 20px;
        padding: 0;
    }

    ul.intro-social-buttons > li:last-child {
        margin-bottom: 0;
    }

    .intro-divider {
        width: 100%;
    }
}

.network-name {
    text-transform: uppercase;
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 2px;
}

.content-section-a {
    padding: 50px 0;
    background-color: #f8f8f8;
}

.content-section-b {
    padding: 50px 0;
    border-top: 1px solid #e7e7e7;
    border-bottom: 1px solid #e7e7e7;
}

.section-heading {
    margin-bottom: 30px;
}

.section-heading-spacer {
    float: left;
    width: 200px;
    border-top: 3px solid #e7e7e7;
}

.banner {
    padding: 100px 0;
    color: #f8f8f8;
    background: url(../img/banner-bg.jpg) no-repeat center center;
    background-size: cover;
}

.banner h2 {
    margin: 0;
    text-shadow: 2px 2px 3px rgba(0,0,0,0.6);
    font-size: 3em;
}

.banner ul {
    margin-bottom: 0;
}

.banner-social-buttons {
    float: right;
    margin-top: 0;
}

@media(max-width:1199px) {
    ul.banner-social-buttons {
        float: left;
        margin-top: 15px;
    }
}

@media(max-width:767px) {
    .banner h2 {
        margin: 0;
        text-shadow: 2px 2px 3px rgba(0,0,0,0.6);
        font-size: 3em;
    }

    ul.banner-social-buttons > li {
        display: block;
        margin-bottom: 20px;
        padding: 0;
    }

    ul.banner-social-buttons > li:last-child {
        margin-bottom: 0;
    }
}

footer {
    padding: 50px 0;
    background-color: #f8f8f8;
}

p.copyright {
    margin: 15px 0 0;
}

Code from landing-header.hbs:

<!-- Header -->
<a name="about"></a>
<div class="intro-header">
    <div class="container">
        <div class="row">
            <div class="col-lg-12">
                <div class="intro-message">
                    <h1>Fairness with a cause</h1>
                    <h2>Coral Safe, Ocean Safe, Human Safe</h2>
                    <h3>25% profits donated to the <a href="http://ift.tt/22B2ofw">Coral Restoration Foundation</a> </h3>
                    <hr class="intro-divider">
                    <ul class="list-inline intro-social-buttons">
                        <li>
                            <a href="#" class="btn btn-default btn-lg"><i class="fa fa-twitter fa-fw"></i> <span class="network-name">Twitter</span></a>
                        </li>
                        <li>
                            <a href="#" class="btn btn-default btn-lg"><i class="fa fa-github fa-fw"></i> <span class="network-name">Github</span></a>
                        </li>
                        <li>
                            <a href="#" class="btn btn-default btn-lg"><i class="fa fa-linkedin fa-fw"></i> <span class="network-name">Linkedin</span></a>
                        </li>
                    </ul>
                </div>
            </div>
        </div>
    </div>
    <!-- /.container -->

</div>
<!-- /.intro-header -->

You also can see that both the /public/img folder does contain the Beach.jpg image AND the /dist/img/ folder also contains it.