* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    padding: 20px;
}

.menu {
    list-style: none;
    background-color: blue;
    display: flex; 
    flex-wrap: wrap;
}

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

.menu a {
    display: block;
    padding: 15px 20px;
    color: white;
    text-decoration: none;
    font-size: 14px;
    font-weight: bold;
    white-space: nowrap;
}

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

.sub {
    list-style: none;
    position: absolute;
    top: 100%; 
    left: 0;
    background-color: blue;
    display: none; 
    min-width: 200px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    z-index: 10;
}

.sub li {
    border-bottom: 1px solid white;
    position: relative; 
}

.grand {
    list-style: none;
    position: absolute;
    top: 0;
    left: 100%;
    background-color: blue;
    display: none;
    min-width: 220px;
}

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

.sub li:hover > .grand {
    display: block;
}