body
{
    font-family: Arial, sans-serif;
    font-size: 16px;
    margin: 0px;
    text-align: justify;
}

header
{
    width: calc(100% - 40px);
    height: auto;
    overflow: hidden;
    padding: 10px 20px; 
    background-color: cadetblue;
}
header .title
{
    float: left;
    width: auto;
    font-weight: bold;
    color: #fff;
    text-transform: uppercase;
}
header .author
{
    float: right;
    width: auto;
    font-weight: 400;
    color: #eee;
}

main
{
    width: 80%;
    height: auto;
    overflow: hidden;
    margin: 30px auto;
}

main h1
{
    color:#555;
    text-align: center;
    margin-bottom: 40px;
}

main h2
{
    color:#777;
    font-size: 20px;
    margin: 40px 0px;
}

main h3
{
    color:#777;
    font-size: 16px;
    text-indent: 20px;
    margin-bottom: 30px;
}

main p
{
    color:#777;
    line-height: 1.5;
}
main p.code
{
    color:cadetblue;
    line-height: 1.2;
    margin: 0px;
}
main p.code.indented
{
    text-indent: 30px;
    color:darkseagreen;
}
main p span
{
    color:cadetblue;
    font-weight: bold;
}
main p span.indented
{
    color:#777;
    font-weight: 400;
    text-indent: 20px;
}
main ol li
{
    color:#777;
    line-height: 1.5;
    margin-bottom: 10px;
}

main ol li span
{
    color:cadetblue;
    font-weight: bold;
}

footer
{
    width: calc(100% - 40px);
    height: auto;
    overflow: hidden;
    padding: 10px 20px; 
    background-color: cadetblue;
}
footer p
{
    float: left;
    width: auto;
    color: #fff;
}