html, body {
    min-width: 290px;
    margin: 8px;
    font-family: 'Helvetica'; 
    font-size: 18px;
    line-height: 1.6;
    color: #4d4e53;
}

.image {
    display: flex;
    justify-content: center;
}

#navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 200px;
    height: 100%;
    border-right: 1px solid rgba(0,22,22,0.4);
}

#navbar ul {
    height: 88%;
    padding: 0;
    overflow-y: auto;
    list-style: none;
}

#navbar li {
    border-top: 1px solid;
}

#navbar a {
    display: block;
    padding: 10px 30px;
    color: inherit;
    text-decoration: none;
    cursor: pointer;
}

#main-doc {
    margin-left: 210px;
    padding: 20px;
    margin-bottom: 110px;
}

header {
    text-align: center;
    font-size: 2em; 
    margin: 10px;
    color: black;
}

section {
    text-align: left;
}

section li, footer {
    list-style-type: circle;
    font-family: inherit; 
    font-size: 1em; 
}


p {
    margin: 1em 0;
    font-family: inherit; 
}


code {
    display: block;
    padding: 8px;
    background-color: #f4f4f4;
    margin: 10px 0;
    border-left: 3px solid #ccc;
}

/* mobile */
@media only screen and (max-width: 600px) {
    body { margin: 0; }
    #navbar {
        position: relative;
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid rgba(0,22,22,0.4);
        background-color: white;
    }
    #navbar ul { max-height: 200px; overflow-y: auto; height: auto; }
    #navbar header { font-size: 1.5em; padding: 10px; }
    #main-doc { margin-left: 0; padding: 15px; }
}