html, 
body {
    background-image: url(https://wallpaperboat.com/wp-content/uploads/2019/04/rick-and-morty-wallpaper-portal-wallpaper-001.jpg);
    min-width: 290px;
    color: #4d4e53;
    background-color: #ffffff;
    font-family: 'Trebuchet MS', Tahoma, sans-serif;
    line-height: 1.5;
}

a {
    color: #32CD32;
}

    a:visited {
        color: #355E3B;
    }

img {
    max-width: 100%;
    height: auto;
    margin: 0 auto;
    border-radius: 50px;
}

section {
    padding: 20px;
    margin: 15 10;
    border-radius: 50px;
    background-color: #FFFDD0;
}

#navbar {
    background-color: #FFFAA0;
    position: fixed;
    min-width: 290px;
    top: 0px;
    left: 0px;
    width: 300px;
    height: 100%;
    border-right: solid;
    border-color: rgba(0, 22, 22, 0.4);
}

header {
    color: black;
    margin: 10px;
    text-align: center;
    font-size: 1.8em;
    font-weight: thin;
}

#main-doc header {
    text-align: left;
    margin: 0px;
}

#navbar ul {
    height: 88%;
    padding: 0;
    overflow-y: auto;
    overflow-x: hidden;
}

#navbar li {
    color: #4d4e53;
    border-top: 1px solid;
    list-style: none;
    position: relative;
    width: 100%;
}

#navbar a {
    display: block;
    padding: 10px 30px;
    color: #4d4e53;
    text-decoration: none;
    cursor: pointer;
}

#main-doc {
    position: absolute;
    margin-left: 310px;
    padding: 20px;
    margin-bottom: 110px;
}

section article {
    color: #4d4e53;
    margin: 15px;
    font-size: 0.96em;
}

section li {
    margin: 15px 0px 0px 20px;
}

code {
    display: block;
    text-align: left;
    white-space: pre-line;
    position: relative;
    word-break: normal;
    word-wrap: normal;
    line-height: 2;
    background-color: #98FB98;
    padding: 15px;
    margin: 10px;
    border-radius: 5px;
}

@media only screen and (max-width: 815px) {
    /* For mobile phones: */
    #navbar ul {
        border: 1px solid;
        height: 207px;
    }

    #navbar {
        background-color: white;
        position: absolute;
        top: 0;
        padding: 0;
        margin: 0;
        width: 100%;
        max-height: 275px;
        border: none;
        z-index: 1;
        border-bottom: 2px solid;
    }

    #main-doc {
        position: relative;
        margin-left: 0px;
        margin-top: 270px;
    }
}

@media only screen and (max-width: 400px) {
    #main-doc {
        margin-left: -10px;
    }

    code {
        margin-left: -20px;
        width: 100%;
        padding: 15px;
        padding-left: 10px;
        padding-right: 45px;
        min-width: 233px;
    }