.sidebar {
    margin: 0;
    padding: 0;
/*    width: 200px;
    background-color: #f1f1f1;
    background-color: darkgray;
    position: fixed;*/
    height: 100%;
    overflow: auto;
}

    .sidebar a {
        display: block;
/*        color:black;*/
        color: white;
        padding: 5px;
        text-decoration: none;
    }

        .sidebar a.active {
            background-color: #4CAF50;
            color: white;
        }

        .sidebar a:hover:not(.active) {
            background-color: #555;
            color: white;
        }

div.content {
    margin-left: 200px;
    padding: 1px 16px;
    height: 1000px;
}

@mediascreenand(max-width:700px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }

    .sidebara {
        float: left;
    }

    div.content {
        margin-left: 0;
    }
}

@mediascreenand(max-width:400px) {
    .sidebara {
        text-align: center;
        float: none;
    }

}