body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.side-nav {
    margin: 0;
    padding: 0;
    width: 200px;
    position: fixed;
    height: 100%;
    overflow: auto;
    background-color: #222222;
}

.side-nav a {
    display: block;
    text-decoration: none;
    padding: 16px;
    color: #fff;
}

.active {
    background-color: #0081cb;
}

.side-nav a:hover {
    background-color: #0081cb;
}

.content {
    margin-left: 200px;
    padding: 1px 16px;
}

@media screen and (max-width: 700px) {
    .side-nav {
        width: 100%;
        height: auto;
        position: relative;
    }
    .side-nav a {
        float: left;
    }
    .content {
        margin-left: 0;
    }
}

@media screen and (max-width: 550px) {
    .side-nav a {
        float: none;
        text-align: center;
    }
}