/* Add custom CSS styles below */ 
header {
.prestige-header 

 height: 70%;
}
.slider {
    width: 80%;
    height: 400px; 
    overflow: hidden; 
    position: relative; 
    margin: auto; 
}

.slider img {
    width: 100%;
    height: auto; 
    display: block; 
}
<!-- Chrome, Firefox OS and Opera -->
<meta name="theme-color" content="#0a0a0a">
<!-- Windows Phone -->
<meta name="msapplication-navbutton-color" content="#0a0a0a">
<!-- iOS Safari -->
<meta name="apple-mobile-web-app-status-bar-style" content="#0a0a0a">
<!-- Windows Phone -->
<meta name="msapplication-navbutton-color" content="#0a0a0a">
<!-- iOS Safari -->
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="#0a0a0a">
<!-- iOS Chrome -->
<meta name="apple-mobile-web-app-status-bar-style" content="#0a0a0a">