body {
    margin:0;
    padding:0;
    background: url("../img/notebook-1280538_1920.jpg") no-repeat center fixed;
    background-size: cover; /* version standardisée */
    color: white;
}

h1 {
    margin: 4% 0px;
    text-shadow: 1px 1px 3px #333;
    font-size: 3em;
}

h1 em {
    font-family: Segoe UI Light;
    font-size: 0.8em;
}

a.orange-link {
    color: white;
    text-shadow: 1px 1px 3px #333;
    background-color: darkgoldenrod;
    display: inline-block;
    margin: 5px;
    padding: 5px 15px;
    border-radius: 30px; 
    height: 40px;
}

a.orange-link:hover {
    background-color: darkorange;
    text-shadow: 1px 1px 4px #000;
    text-decoration: none;
}