html, body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    margin: 0;
}

* {
    box-sizing: border-box;
}

#header {
    flex-shrink: 0;
    background-color: #b2b2b2;
}

#main {
    flex: 1 0 auto;
    background-color: #bbb;
    padding: 0 15px;
}

#footer {
    flex-shrink: 0;
    background-color: rgba(150, 200, 200, 1);
    padding-left: 20px
}

.header-content {
    display: grid;
    grid-template-columns: auto;
    background-color: #41C7C7;
    text-align: center;
}

    .header-content a {
        text-decoration: none;
    }

    .header-content li {
        list-style-type: none;
        display: inline-block;
        text-decoration: none;
    }

        .header-content li a {
            font-size: 1.0em;
            padding: 6px 10px;
        }

    .header-content #logo {
        background-color: #41C7C7;
        font-size: 2.0em;
        padding: 4px 10px;
    }

    .header-content nav {
        background-color: #48d7d7;
    }


@media only screen and (min-width: 576px) {
    .header-content a {
        padding: 16px 16px;
    }
}

@media only screen and (min-width: 768px) {
    .header-content {
        grid-template-columns: auto auto;
        text-align: left;
    }

        .header-content li {
            padding: 6px 10px;
        }

        .header-content #logo {
            background-color: transparent;
            margin-left: 60px;
        }

        .header-content nav {
            background-color: transparent;
        }

        .header-content li a:hover {
            color: white;
            background-color: rgba(0, 0, 0, 0.30);
            border-radius: 40px 40px 16px 16px;
        }
}

@media only screen and (min-width: 992px) {
}

@media only screen and (min-width: 1200px) {
}