style.css
body {
    margin: 0;
}

.nav {
    max-height: 50px;
    width: 100%;
    background-color: lightgrey;
}

.nav-list {
    margin: 0;
    height: inherit;
    padding-top: 15px;
    padding-bottom: 15px;
}

.list-el {
    display: inline;
    padding: 20px;
}

.list-el a {
    text-decoration: none;
    color: inherit;
}

.list-el a:hover {
    color: white;
}

.container {
    margin: 100px 100px;
}

header {
    height: 400px;
    background-image: url('./img/fond.jpg');
    background-position: center;
    background-size: cover;
}

h1 {
    color: #FFF;
    margin: 0;
    text-align: center;
    vertical-align: middle;
}

footer {
    background-color: #00CD99;
    padding: 15px 15px 15px 15px;
    color: #FFF;
}