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CSS

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HTML 

              
                <nav>
        <h3><a href="#">Start Bootstrap</a></h3>
        <ul>
            <li><a href="#">Services</a></li>
            <li><a href="#">Portfolio</a></li>
            <li><a href="#">About</a></li>
            <li><a href="#">Team</a></li>
            <li><a href="#">Contact</a></li>
        </ul>
    </nav>



    <!-- Masthead -->

    <header class="masthead d-flex">
        <div class="container text-center my-auto">
            <h1 class="mb-1 type-it bounceInDown animated"></h1>
            <p class="lead maintxt bounceInDown animated">I am a Front End developer based in the UK. If you are a business seeking a web presence or an employer looking to hire, you can get in touch with me <a href="#contact" class="txtlink2 js-scroll-trigger" target="_blank">here</a>.</p>
            <hr class="home bounceInDown animated">
            <a class="btn btn-primary btn-xl rounded js-scroll-trigger bounceInDown animated" href="#features-icons">Find Out More <i class="fa fa-chevron-down" aria-hidden="true"></i></a>
        </div>
    </header>

    <!-- Icons Grid -->
    <section class="features-icons bg-light text-center" id="features-icons">
        <div class="container">
            <h2 class="mb-5">What You Can Expect</h2>
            <hr class="black">
            <div class="row">
                <div class="col-lg-4">
                    <div class="features-icons-item mx-auto mb-5 mb-lg-0 mb-lg-3">
                        <div class="features-icons-icon d-flex">
                            <i class="fas fa-desktop m-auto text-primary"></i>
                        </div>
                        <h3>Fully Responsive</h3>
                        <p class="lead mb-0">This theme will look great on any device, no matter the size!</p>
                    </div>
                </div>
                <div class="col-lg-4">
                    <div class="features-icons-item mx-auto mb-5 mb-lg-0 mb-lg-3">
                        <div class="features-icons-icon d-flex">
                            <i class="fas fa-desktop m-auto text-primary"></i>
                        </div>
                        <h3>Bootstrap 4 Ready</h3>
                        <p class="lead mb-0">Featuring the latest build of the new Bootstrap 4 framework!</p>
                    </div>
                </div>
                <div class="col-lg-4">
                    <div class="features-icons-item mx-auto mb-0 mb-lg-3">
                        <div class="features-icons-icon d-flex">
                            <i class="fas fa-desktop m-auto text-primary"></i>
                        </div>
                        <h3>Easy to Use</h3>
                        <p class="lead mb-0">Ready to use with your own content, or customize the source files!</p>
                    </div>
                </div>
            </div>
        </div>
    </section>

    <!-- Testimonials -->
    <section class="testimonials text-center bg-light">
        <div class="container">
            <h2 class="mb-5">What people are saying...</h2>
            <hr class="black">
            <div class="row">
                <div class="col-lg-4">
                    <div class="testimonial-item mx-auto mb-5 mb-lg-0">
                        <img class="img-fluid rounded-circle mb-3" src="images/testimonials-1.jpg" alt="">
                        <h5>Margaret E.</h5>
                        <p class="font-weight-light mb-0">"This is fantastic! Thanks so much guys!"</p>
                    </div>
                </div>
                <div class="col-lg-4">
                    <div class="testimonial-item mx-auto mb-5 mb-lg-0">
                        <img class="img-fluid rounded-circle mb-3" src="images/testimonials-2.jpg" alt="">
                        <h5>Fred S.</h5>
                        <p class="font-weight-light mb-0">"Bootstrap is amazing. I've been using it to create lots of super nice landing pages."</p>
                    </div>
                </div>
                <div class="col-lg-4">
                    <div class="testimonial-item mx-auto mb-5 mb-lg-0">
                        <img class="img-fluid rounded-circle mb-3" src="images/testimonials-3.jpg" alt="">
                        <h5>Sarah W.</h5>
                        <p class="font-weight-light mb-0">"Thanks so much for making these free resources available to us!"</p>
                    </div>
                </div>
            </div>
        </div>
    </section>



    <!-- Footer -->
    <footer class="py-5 bg-dark">
        <div class="container">
            <p class="m-0 text-center text-white">Copyright &copy; Your Website 2018</p>
        </div>
        <!-- /.container -->
    </footer>
    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Kaushan+Script|Montserrat');
html {
  height: 1200px;
  font-size: 16px;
}

body {
  height: 100%;
  background: url("https://blackrockdigital.github.io/startbootstrap-agency/img/header-bg.jpg") no-repeat center top / cover;
}

body * {
  /* border: 1px solid; */
}

nav {
  position: fixed;
  top: 0;
  left: 0;
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 1rem 0;
  width: 100%;
  transition: background-color 100ms linear;
}

nav * {
  margin: 0;
  padding: 0;
}

nav h3 {
  flex: 1;
  text-align: center;
}

nav h3 a {
  display: inline-block;
  /* margin-left: 0.33rem; */
  color: #fed136;
  font-family: 'Kaushan Script', Helvetica, Arial, cursive;
  font-size: 1.75rem;
  text-decoration: none;
  transition: font-size 200ms linear;
}

nav ul {
  flex: 1;
  display: flex;
  justify-content: center;
}

nav ul li {
  display: inline-block;
  margin: 0.5rem;
}

nav ul li:last-child {
  margin-right: 4rem;
}

nav ul li a {
  color: white;
  font-family: Montserrat, Helvetica, Arial, sans-serif;
  font-size: 0.9rem;
  text-decoration: none;
  text-transform: uppercase;
}

nav ul li a:hover {
  color: #fed136;
}

.scrolled-nav {
  background-color: #212529;
}

.scrolled-nav h3 a {
  font-size: 1rem;
}



h1 {
    font-weight: 700;
    text-transform: uppercase;
}

h2,
{
    font-weight: 700;
    text-transform: uppercase;
    margin-top: 0;
    margin-bottom: .5rem
}

p {
    margin-top: 0;
    margin-bottom: 1rem
}

.masthead {
    color: #fff;
    min-height: 30rem;
    width: 100%;
    height: auto;
    padding-top: 8rem;
    padding-bottom: 8rem;
    background: url(../images/header.jpg);
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
}

.masthead h1 {
    font-size: 3rem;
    margin: 0;
    padding: 0
}

@media (min-width:992px) {
    .masthead {
        height: 100vh
    }
    .masthead h1 {
        font-size: 3.5rem
    }
}

.features-icons {
    padding-top: 7rem;
    padding-bottom: 7rem;
}

.features-icons .features-icons-item {
    max-width: 20rem
}

.features-icons .features-icons-item .features-icons-icon {
    height: 7rem
}

.features-icons .features-icons-item .features-icons-icon i {
    font-size: 4.5rem
}

.features-icons .features-icons-item:hover .features-icons-icon i {
    font-size: 5rem
}

.testimonials {
    padding-top: 7rem;
    padding-bottom: 7rem
}

.testimonials .testimonial-item {
    max-width: 18rem
}

.testimonials .testimonial-item img {
    max-width: 12rem;
    box-shadow: 0 5px 5px 0 #adb5bd
}

footer.footer {
    padding-top: 4rem;
    padding-bottom: 4rem
}

.mt-4,
.my-4 {
    margin-top: 1.5rem !important
}

hr.black {
    border-color: black;
    max-width: 3.125rem;
    border-width: 0.2rem;
}

hr.white {
    border-color: white;
    max-width: 3.125rem;
    border-width: 0.2rem;
}

hr.home {
    border-color: white;
    max-width: 9rem;
    border-width: 0.2rem;
}

.txtlink2 {
    color: #fff;
    font-weight: bold;
}

.txtlink2:hover {
    color: #fff;
    text-decoration: underline;
}


/*Extra small devices (portrait phones, less than 576px) // No media query since this is the default in Bootstrap
Small devices (landscape phones, 576px and up)*/

@media (min-width: 576px) {
    .maintxt {
        max-width: ;
    }
}


/* Medium devices (tablets, 768px and up)*/

@media (min-width: 768px) {
    .maintxt {
        max-width: ;
    }
}


/* Large devices (desktops, 992px and up)*/

@media (min-width: 992px) {
    .maintxt {
        max-width: ;
    }
}


/* Extra large devices (large desktops, 1200px and up)*/

@media (min-width: 1200px) {
    .maintxt {
        max-width: ;
    }
}

nav {
    position: fixed;
    top: 0;
    left: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 1rem 0;
    width: 100%;
    transition: background-color 100ms linear;
}

nav * {
    margin: 0;
    padding: 0;
}

nav h3 {
    flex: 1;
    text-align: center;
}

nav h3 a {
    display: inline-block;
    /* margin-left: 0.33rem; */
    color: #fed136;
    font-family: 'Kaushan Script', Helvetica, Arial, cursive;
    font-size: 1.75rem;
    text-decoration: none;
    transition: font-size 200ms linear;
}

nav ul {
    flex: 1;
    display: flex;
    justify-content: center;
}

nav ul li {
    display: inline-block;
    margin: 0.5rem;
}

nav ul li:last-child {
    margin-right: 4rem;
}

nav ul li a {
    color: white;
    font-family: Montserrat, Helvetica, Arial, sans-serif;
    font-size: 0.9rem;
    text-decoration: none;
    text-transform: uppercase;
}

nav ul li a:hover {
    color: #fed136;
}

.scrolled-nav {
    background-color: #212529;
}

.scrolled-nav h3 a {
    font-size: 1rem;
}
!

JS 

              
                jQuery(document).ready(function($) {
    $('.type-it').typeIt({
        content: 'Hi, my name is Liam Docherty'
    });
});

const nav = document.querySelector('nav');

window.addEventListener('scroll', () => {
    const scrollY = window.scrollY;

    if (scrollY < 100) {
        nav.classList.remove('scrolled-nav');
    } else if (scrollY >= 100 && scrollY < 200) {
        nav.classList.add('scrolled-nav');
    }
});
!
999px
Keep the <main> thing the <main> thing.

Console