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

#menu {
    background-color: #333;
    padding: 4px;
}

#menu ul {
    list-style: none;
}

#menu ul li {
    display: inline-block;
    position: relative;
    margin-right: 20px;
}

#menu ul li a {
    color: #fff;
    text-decoration: none;
    padding: 8px 10px;
    display: block;
    transition: background-color 0.3s;
}

#menu ul li a:hover {
    background-color: #555;
}

#menu ul ul {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background-color: #444;
    border-radius: 0 0 5px 5px;
}

#menu ul li:hover > ul,
#menu ul li:focus-within > ul {
    display: block;
}


#menu ul ul li {
    width: 100%; 
    box-sizing: border-box; 
    margin: 0;
}


.footer{
    margin-top: 2rem;
    margin-left: 10px;
    margin-right: 10px;
}

/* RWD */
@media (max-width: 700px) {
    #menu ul li {
        display: block;
        margin-right: 0;
    }

    #menu ul ul {
        position: static;
        border-radius: 0;
    }

    #menu ul ul li a {
        padding-left: 25px;
        font-size: 0.9em;
        word-break: break-word;
    }
}