html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
    background-color: white;
}
body {
    display: flex;
    align-items: center;
    justify-content: center;
}

body>* {
    position: relative;
    z-index: 1;
}

body:before {
    opacity: .5;
    inset: 0;
    position: fixed;
    content: '';
    background: url(/images/fond.jpg);
    background-size: cover;
    z-index: 0;

}

a {
    color:inherit
}

.links {
    background-color: white;
    padding: 1rem;
}

.links ul {
    list-style: none;
    margin: 0;
    padding:0;
}