html {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 14pt;
    line-height: 1.3;
}

body {
    width: 800px;
    max-width: 90%;
    margin: 5rem auto;
}

article {
    margin: 5rem 0;
}

section {
    margin: 3rem 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: normal;
}

article>h1 {
    font-weight: bold;
}

samp {
    display: block;
    margin: 1em 0;
}

code,
kbd {
    color: steelblue;
    font-style: normal;
    font-weight: normal;
}

code.tag::before {
    content: "<";
}

code.tag::after {
    content: ">";
}

ol.instructions {
    background-color: #f2f2f2;
    padding: 1rem 1rem 1rem 2rem;
    color: #666666;
    font-style: italic;
    font-size: 0.8rem;
    line-height: 1.2;
}

ol.instructions>li {
    margin: 0.4rem 0;
}

ol.instructions>li:first-child {
    margin-top: 0;
}

ol.instructions>li:last-child {
    margin-bottom: 0;
}

aside {
    padding: 1rem 2rem;
    color: white;
    background-color: gray;
    font-size: 0.8rem;
    margin: 1em 0;
}

.overflow-example {
    padding: 1rem;
    border: 1px solid gray;
}

.portrait {
    width: 125px;
    float: left;
    margin: 0 2rem;
}

.positioned-element {
    width: 50px;
    height: 50px;
    background-color: #ccc;
}

.static-example,
.relative-example,
.absolute-example,
.fixed-example,
.sticky-example {
    border: 1px solid #999;
    padding: 0 1rem;
}

.instructions {
    clear: both;
}