body {
    margin: 0;
}

header > div,
#content > div {
    padding: 20px;
}

footer {
    white-space: nowrap;
    height: 100px;
}

footer > div {
    margin-top: 32px;
}

header ul,
footer ul {
    margin: 0;
    padding: 0;
}

@media screen and (max-width: 899px) {
    header,
    footer {
        text-align: center;
    }

    header .menu > ul > li,
    footer .menu > ul > li {
        margin-top: 1em;
    }

    footer .menu > ul {
        margin-bottom: 1em !important;
    }
}

@media screen and (min-width: 900px) {
    header > div,
    #content > div,
    footer > div {
        margin-left: auto;
        margin-right: auto;
    }

    header > div,
    footer > div {
        display: flex;
    }

    header .menu,
    footer .menu {
        width: 100%;
        text-align: right;
    }

    header .menu {
        width: 100%;
        text-align: right;
        margin-top: 40px;
    }

    header ul > li,
    footer ul > li {
        display: inline;
    }

    header span,
    header .menu img,
    footer span {
        vertical-align: middle;
    }
}

@media screen and (min-width: 900px) and (max-width: 1299px) {
    header > div,
    #content > div,
    footer > div {
        width: 800px;
    }

    header ul > li,
    footer ul > li {
        margin-left: 20px;
    }
}

@media screen and (min-width: 1300px)
{
    header > div,
    #content > div,
    footer > div {
        width: 1200px;
    }

    header ul > li,
    footer ul > li {
        margin-left: 40px;
    }
}