My background image on my website is not being displayed on the whole page. It is under the div .hero-image 
Screenshot of problem: http://prntscr.com/oe6bn7
    <div class="hero-image">
        <div class="hero-text">
        <h1>Ruan Kuypers</h1>
        <h2>Websites. Done. Right.</h2>
        <h3>A relighable business partner.</h3>
        </div>
    </div>
.hero-image{
    background-image: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url("img/Header.jpg");
    height: 100%;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
}
 
    