DEMO web page (1) www.wikihow.com

# https://www.wikihow.com/Clean-a-Pond

web page code:

CSS style:

html, body, div, span, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, del, ins, em, img, small, strike, strong, sub, sup, tt, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, input, textarea, button, select, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font: inherit;
    font-size: 100
    vertical-align: baseline;

    background: none;
}
* {
    -webkit-tap-highlight-color: transparent;
}
div {
    -webkit-locale: "en";
    direction: ltr;
    unicode-bidi: isolate;
}
div {
    display: block;
}


.content {
    margin: 0;
    word-wrap: break-word;
}

body {
    background-color: #f3f3f3;
    color: #545454;
    // font-family: "Helvetica","Nimbus Sans L","Arial","Liberation Sans",sans-serif;
    // line-height: 1.4;
    // font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

#intro.hasad {
    padding-bottom: 0;
    border-bottom: 0;
}
#intro {
    font-size: 1em;
    margin: 0;
    border-radius: 0 0 4px 4px;
    padding: 7px 26px;
}

#intro {
    background-color: #FFF;
    // margin: 0;
    // padding: 7px 15px 3px;
}
.section {
    // margin-top: 1em;
    position: relative;
}

a.large_pdf_link, a.large_audio_link {
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    -ms-flex-align: center;
    align-items: center;
    float: right;
    font-weight: bold;
    margin: -5px 127px 5px 5px;
    font-size: 12.5px;
    color: #333333;
    background-color: #F6F8F7;
    padding: 0.45em 1.1rem;
    border-radius: 8px;
    position: relative;
    z-index: 6;
}
a, a:active, a:visited, a.new {
    color: #307530;
    text-decoration: none;
    word-wrap: break-word;
}


#method_toc {
    display: block;
    position: static;
    font-size: 12px;
    font-weight: bold;
    line-height: 1.65em;
    color: #222222;
    float: right;
    background-color: #f6f8f7;
    border-radius: 6px;
    width: 260px;
    padding: 8px 15px 15px 15px;
    margin: 2px 0 10px 10px;
    clear: right;
}

#coauthor_byline {
    margin-bottom: 0.75rem;
}
.article_byline {
    color: #545454;
    font-size: .85em;
}

@media only screen and (min-width: 728px)
#byline_hover {
    z-index: 6;
    position: absolute;
    top: 28px;
    width: 375px;
    max-width: 375px;
    font-size: 13px;
    line-height: 1.5em;
    border: 4px solid #7fa065;
    border-radius: 6px;
    background-color: #FFF;
}

#byline_hover {
    z-index: 6;
    position: absolute;
    top: 65px;
    left: 0;
    background: #FFFFFF;
    border: 2px solid #7FA065;
    border-radius: 6px;
    padding: 20px;
    -moz-background-clip: padding;
    -webkit-background-clip: padding;
    background-clip: padding-box;
    margin: 0 10px;
    max-width: 30em;
    font-size: 12.99px;
}