* {
    margin: 0px;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #669900;
    text-align: justify;
}

.titre {
    margin-top: 20px;
    margin-left: 20px;
    text-align: center;
    text-decoration: underline;
}

header {
    text-align: center;
    background-color: black;
    color:white;
    padding-top: 10px;
    margin-bottom: 0px;
}
nav {
    text-align: center;
    background-color: black;
    font-size: 150%;
    color: white;
    padding-top: 10px;
    padding-bottom: 10px;
}

nav ul li {
    display: inline;
    color: white;
    margin-right: 20px;
}

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

section {
    margin-top: 20px;
    margin-left: 20px;
    margin-right: 100px;
    font-size: 130%;
}

section h2 {
    margin-bottom: 5px;
}

section p {
    margin-bottom: 20px;
}

section ul {
    margin-bottom: 20px;
}

section ul li {
    margin-bottom: 5px;
}

section ol li {
    margin-bottom: 10px;
}

footer {
    text-align: center;
    font-style: italic;
    margin-top: 100px;
    margin-bottom: 20px;
}