body {
    background-color: #CCC;
}

h1 {
    text-align: center ;
    /*font-family: Marker Felt, fantasy ;*/
}

td {
    border: 2px solid black;
    border-collapse: collapse;
    text-align: center;
    width: 26%;
}

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

nav {
    width: 100%;
    margin: 0 auto;
    background-color: #B0B0BB;
    position: sticky;
    top: 0px;
}

nav ul {
    list-style-type: none;
}

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

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

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

nav a {
    color: #000000;
    border: 0px solid #000000;
}

.sous {
    display: none;
    box-shadow: 0px 1px 2px #CCC;
    background-color: #B0B0BB;
}

nav > ul li:hover .sous {
    display: block;
}

.sous li {
    float: none;
    width: 100%;
    text-align: left;
}

.sous a {
    padding: 10px;
}

.sous a:hover {
    background-color: RGBa(200,200,200,0.1);
}

.deroulant > a::after {
    content: " ▼";
    font-size: 12px;
}

.sous {
    display: none;
    box-shadow: 0px 1px 2px #CCC;
    background-color: #B0B0BB;
    position: absolute;
    width: 100%;
    z-index: 1000;
}

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

.login-table {
    width: 80%;
    display: block;
    margin: auto;
    border-collapse: collapse;
}

.login-cell {
    padding: 10px;
}

main, header p {
    margin-left: 10%;
    margin-right: 10%;
    margin-top: 50px;
    margin-bottom: 50px;
}

header h1 {
    margin-top: 80px;
}

fieldset {
    margin-top: 50px;
    margin-bottom: 50px;
    padding: 40px;
}