html{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

* {
    box-sizing: inherit;
}

.produits{
    background-color: #71cbee;
}

.index{
    background-color: #71eec2;
}



div.interface{
    width: 60%;
    background-color: #fff;
    margin: 0 auto;
    padding: 1em;
}

h1{
    text-align: center;
    text-transform: uppercase;
    margin-top: 2em;
}

.produits h1{
    color: #71cbee;
}

.index h1{
    color: #71eec2;
}

h2{
    margin-top: 2em;
}

.menu_principal ul{
    list-style-type: none;
    padding-inline-start : 0;
}

.menu_principal a{
    display: block;
    text-decoration: none;
    padding: 20px;
}

.menu_principal > ul > li{
    margin-bottom: 2px;
}

.menu_principal > ul > li > a{
    background-color: #0e85b4;
    color: white;
    text-align: center;
}

.menu_principal > ul > li > a:hover{
    background-color: #06384d;
    color: #40c1e9;
    text-align: center;
}

.sous-menu > li > a{
    background-color: #71cbee;
    color: #0e85b4;
}

.sous-menu > li > a:hover{
    background-color: #4ba4c7;
    color: #a6d9ed;
}

.sous-menu{
    display: none;
}

.menu_principal > ul > li:hover > ul {
    display: block;
}