body {
    display: flex;
}

html, body {
    height: 100%;
    width: 100%;
    margin: 0;
}

#menu {
    list-style-type: none;
    margin: 0;
    padding: 0;
    width: 220px;
    background-color: #f1f1f1;
    height: 100%;
    overflow: auto;
    flex-grow: 0;
}

#menu a {
    display: block;
    color: #000;
    padding: 10px 20px;
    text-decoration: none;
}

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

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

#menu-logo img {
    width: calc(100% - 40px);
    margin: 40px auto;
    display: block;
}

#main-container {
    margin: 0;
    flex-grow: 1;
    height: 100%;
    overflow-y: scroll;
}

#main-content {
    padding-top: 100px;
    padding-bottom: 100px;
    margin: 0 auto;
    max-width: 1000px;
    text-align: justify;
}

@media only screen and (max-width: 700px) {
    body {
        flex-direction: column;
        height: auto;
    }
    #menu {
        height: auto;
        width: 100%;
        padding-bottom: 20px;
    }
    #menu-logo img {
        height: 70px;
        padding-left: 7px;
    }
    #menu a {
        text-align: center;
    }
    #main-content {
        padding: 100px 16px;
    }
}