h1{
    color: black;
}

body{
  
}

@keyframes fadeIn{
    from{
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

header{
    width: 100%;
    justify-content: space-between;
    align-items: center;
    text-align: center;
    background-color: grey;
    
}

*{
    margin: 0px;
    padding: 0px;
    font-family: Avenir, sans-serif;
}

nav{
    width: 100%;
    margin: 0 auto;
    background-color: rgb(0, 0, 0);
    position: sticky;
    top: 0px;
}

nav ul {
    list-style-type: none;
    display: flex;
    justify-content: center;
    padding: 0;
}

nav ul li{
    float: left;
    width: 25%;
    text-align: center;
    position: relative;
}

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

nav a{
    display: block;
    text-decoration: none;
    color: grey;
    border-bottom: 2px solid transparent;
    padding: 10px 0px;
}

nav a:hover{
    color: blue;
    border-bottom: 2px solid blue;
}

.sous{
    display: none;
    box-shadow: 0px 1px 2px #000000;
    background-color: rgb(0, 0, 0);
    position: absolute;
    width: 100%;
    z-index: 1000;
}
nav > ul li:hover .sous{
    display: block;
}
.sous li{
    float: none;
    width: 100%;
    text-align: left;
}
.sous a{
    padding: 10px;
    border-bottom: none;
    text-align: center;
}
.sous a:hover{
    border-bottom: none;
    background-color: RGBa(200,200,200,0.1);
}
.deroulant > a::after{
    content:" ▼";
    font-size: 12px;
}

footer {
    width: 100%;
    bottom: 0;
    justify-content: space-between;
    text-align: center;
    background-color:black;
    color: grey;
    position: absolute;
    padding: 9px 0; 
}

img{
    width: 50px;
    height: 50px;
    position: relative;
    float: right;
    margin:5px;
}