.menu {
    padding: 0;
    margin: 0;
    list-style: none;

    display: flex;
    justify-content: center;
}

.menu-item {
    position: relative;
    display: flex;
    justify-content: center;
    margin-right: 15px;
    outline: 2px solid tomato;
    min-width: 200px;
    background-color: teal;
}

.menu-item:hover .submenu {
    display: block;
}

.menu-item:hover {
    background-color: palevioletred;
}

.menu-link {
    display: block;
    padding: 10px 20px;

    text-decoration: none;
    color: white;
}

.submenu {
    position: absolute;
    left: 0;
    top: 100%;

    width: 100%;

    margin: 0;
    list-style: none;
    padding: 10px;

    background-color: #ccc;

    display: none;
}

.submenu a {
    text-decoration: none;
}