body {
    margin: 0;
}

nav {
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    background-color: black;
    color: white;
}

nav a {
    padding: 20px;
    width: 100%;
    font-size: 20px;
    text-align: center;
    align-self: center;
}

nav a:link {
    text-decoration: none;
    color: white;
}

nav a:visited {
    color: white;
}

footer {
    position: relative;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    background-color: black;
    width: 100%;
}

footer div {
    color: white;
    padding: 20px;
    font-size: 20px;
}

.active_menu {
    color: black;
    background-color: white;
}

nav a:hover {
    color: black;
    background-color: white;
}

.button_menu {
    border-right: solid 2px;
    border-color: white;
}

@media screen and (max-width: 800px) {
    nav {
        flex-direction: column;
        margin-right: 0;
    }
    nav a {
        margin: 0;
        padding: 2%;
        width: 96%;
    }
    .button_menu {
        border: none;
    }

    footer {
        flex-direction: column;
        justify-content: center;
        align-items: center;
        position: relative;
    }
}