.achtergrond {
    width: 100%;
    height: 100%;
    margin-bottom: -0.5%;
}

img {
    max-width: 100%; 
    height: auto; 
}

header {
    display: block;
}

nav {
    position: relative;
    background-color: black;
    width: 100%;
    height: 20%; 
    box-sizing: border-box;
    z-index: 2;
    display: flex;
    justify-content: flex-start; 
    align-items: center; 
    font-size: 1.6em;
}

nav ul {
    display: flex;
    align-items: center;
}

nav ul li {
    list-style: none;
    padding-right: 70px;
}

nav ul li a {
    text-decoration: none;
    color: white;
}

body, header {
    margin: 0;
    padding: 0;
}

footer {
    margin-top: 0;
}

footer {
    background-color:black;
    color: white;
    text-align: center;
    padding: 1px;
    box-sizing: border-box;
    z-index: 2;
    position: fixed;
    bottom: 0; 
    width: 100%;
    display: block;
    font-size: 1em;
}

nav a:hover{
    text-decoration: underline;
}

html, body {
    height: 100%; 
    margin: 0;
    padding: 0;
    overflow: hidden; 
}