*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(90deg,#6b4900, rgb(24, 24, 24) 40% 60%, #6b4900);
}

nav{
   
    width: 100%;
    margin: 0 auto;
    position: sticky;
    top: 0px;
}

nav ul{
    list-style-type: none;
}

nav li{
    float: left;
    width: 33%;
    text-align: center;
}

nav ul::after{
    content: "";
    display: table;
    clear: both;
}

nav a{
    display: block;
    text-decoration: none;
    color: white;
    border-bottom: 2px solid transparent;
    padding: 10px 0;
    font-size: 1.4em;
}

nav a:hover{
    color: rgb(255, 153, 0);
    border-bottom: 2px solid gold;
}

a.actuel{
    color: rgb(255, 153, 0);
    border-bottom: 2px solid gold;
}

section {
    height: 100%;
    width: 75%;
    /*background-color: rgba(0, 0, 0, 0.237);*/
    text-align: center;
    color: white;
}

h1, h2, p, a {
    margin: 10px 0;
}

h1{
    margin-top: 3%;
    font-family:'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    font-size: 3.7em;
}

h2{
    font-family:'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    font-size: 2em;
}

p{
    margin: 60px;
    font-family:'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    font-size: 1.3em;
}

section div{
    height: 200px;
}