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

.huit-menu {
    background-color: blue;
}

.huit-menu > ul {
    list-style: none;
    display: flex;
}

.huit-menu li {
    position: relative;
    border-right: 1px solid white;
}

.huit-menu a {
    display: block;
    text-decoration: none;
    color: white;
    padding: 12px 20px;
    font-size: 14px;
    white-space: nowrap;
    text-align: center;
}

.huit-menu li:hover > a {
    background-color: oldlace;
    color: blue;
}

.sub-menu, .sub-menu-level3 {
    display: none;
    position: absolute;
    background-color: blue;
    min-width: 200px;
    top: 100%;
    left: 0;
    z-index: 100;
}

.huit-menu li:hover > .sub-menu {
    display: block;
}

.sub-menu li {
     list-style: none;
    width: 100%;
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

.sub-menu-level3 {
    top: 0;
    left: 100%;
}

.sub-menu li:hover > .sub-menu-level3 {
    display: block;
}

.huit-menu li:last-child {
    border-right: none;
}