style.css

body {
    margin: 0;
    font-family: 'Play', sans-serif;
}

.footer{
    background:#000;
    padding:30px 0px;
    font-family: 'Play', sans-serif;
    text-align:center;
    position : absolute;
    width : 100%;
    bottom : 0;
    z-index: 5;
    position: sticky;
}

.footer .row{
    width:100%;
    margin:1% 0%;
    padding:0.6% 0%;
    color:gray;
    font-size:0.8em;
}

.footer .row a{
    text-decoration:none;
    color:gray;
    transition:0.5s;
}

.footer .row a:hover{
    color:#fff;
}

.footer .row ul{
    width:100%;
}

.footer .row ul li{
    display:inline-block;
    margin:0px 30px;
}

.footer .row a i{
    font-size:2em;
    margin:0% 1%;
}


header {
    position: fixed;
    top: 0px;
    left: 0%;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: 0.9s ease-in-out;
    background-color: transparent;
    padding: 40px 100px;
    z-index: 4;
}
/*================
====================
LOGO DU HEADER
====================
==================*/
header #logo {
    transition: 0.6s;
    font-weight: 700;
    color: black;
    text-decoration: none;
    font-size: 2em;
    text-transform: uppercase;
    letter-spacing: 2px;
}
/*================
====================
ELEMENTS DU HEADER
==================
===================*/
header ul {
    padding-right : 15%;
    display: flex;
    justify-content: center;
    align-items: center;
}

header ul li {
    position: relative;
    list-style: none;
}

header ul li a {
    position: relative;
    margin: 0 15px;
    text-decoration: none;
    color: black;
    letter-spacing: 2px;
    font-weight: 500px;
}
/*===================
====================
BARRE DU HEADER(NAV) APRES JS
=================
===================*/
/* NAV COULEUR */
header.active {
    background: black;
    -webkit-box-shadow: 0 1px 5px rgba(0, 0, 0, 0.25);
    -moz-box-shadow: 0 1px 5px rgba(0, 0, 0, 0.25);
    box-shadow: 0 1px 5px rgba(0, 0, 0, 0.55);
}

/* LOGO COULEUR */
header #logo.active {
    color: white;
}

/* COULEUR VILLE */
header ul li a.active {
    color: white;
}

.banner {
    position: relative;
    width: 100%;
    height: 100vh;
    background: url(./faune.jpeg);
    background-size: cover;
    font-size: 3em;
}


@media (max-width:720px){
    .footer{
        text-align:left;
        padding:5%;
    }
    .footer .row ul li{
        display:block;
        margin:10px 0px;
        text-align:left;
    }
    .footer .row a i{
        margin:0% 3%;
    }
}