nav{
    width: 20%;
    height: 71vh;
    margin: 1%;
    background-color: #A7A5F3;
    position: sticky;
    top: 0px;
    float: left;
    font-family: 'Julius Sans One', sans-serif;

}

nav ul{
    list-style-type: none;
    padding: 0;
}

nav ul li{
    float: left;
    width: 100%;
    text-align: center;
}

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

nav a{
    display: block;
    text-decoration: none;
    color: #002A74;
    border-bottom: 2px solid transparent;
    padding: 3px 0px;
}

nav a:hover{
    color: #008BFF;
    border-bottom: 2px solid black;
}

.sous{
    display: none;
    box-shadow: 0px 1px 2px #CCC;
    background-color: #D8D8D8;
}

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

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

.sous a{
    padding: 3px;
    border-bottom: none;
}
.sous a:hover{
    border-bottom: none;
    background-color: #D8D8D8;
}

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

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

nav ul li{
    float: left;
    width: 100%;
    text-align: center;
    position: relative;
}