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                <h1>Menu horizontal sticky HTML et CSS</h1>
    <li><a href="#">Cours Complets</a></li>
    <li><a href="#">Articles</a></li>
    <li><a href="#">Contact</a></li>
    <li><a href="#">A propos</a></li>

<div class="conteneur">
  <p>Du contenu sous le menu</p>


                /*Reset CSS*/
    margin: 0px;
    padding: 0px;
    font-family: Avenir, sans-serif;

    width: 100%;
    margin: 0px auto 40px auto;
    background-color: white;
    position: sticky;
    top: 0px;

nav ul{
    list-style-type: none;

nav li{
    float: left;
    width: 25%;/*100% divisé par le nombre d'éléments de menu*/
    text-align: center;/*Centre le texte dans les éléments de menu*/

/*Evite que le menu n'ait une hauteur nulle*/
nav ul::after{
    content: "";
    display: table;
    clear: both;

nav a{
    display: block; /*Toute la surface sera cliquable*/
    text-decoration: none;
    color: black;
    border-bottom: 2px solid transparent;/*Evite le décalage des éléments sous le menu à cause de la bordure en :hover*/
    padding: 10px 0px;/*Agrandit le menu et espace la bordure du texte*/

nav a:hover{
    color: orange;
    border-bottom: 2px solid gold;

  margin: 0px 20px;
  height: 1500px;